diff --git a/README.md b/README.md
index ed6665cd..40a1110c 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ It is a port of [Shadowsocks](https://github.com/shadowsocks/shadowsocks)
 created by [@clowwindy](https://github.com/clowwindy), which is maintained by
 [@madeye](https://github.com/madeye) and [@linusyang](https://github.com/linusyang).
 
-Current version: 2.4.4 | [Changelog](debian/changelog)
+Current version: 2.4.5 | [Changelog](debian/changelog)
 
 Travis CI: [![Travis CI](https://travis-ci.org/shadowsocks/shadowsocks-libev.svg?branch=master)](https://travis-ci.org/shadowsocks/shadowsocks-libev) | Jenkins Matrix: [![Jenkins](https://jenkins.shadowvpn.org/buildStatus/icon?job=Shadowsocks-libev)](https://jenkins.shadowvpn.org/job/Shadowsocks-libev/)
 
diff --git a/configure b/configure
index 0eaa0dd6..e3cacea4 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for shadowsocks-libev 2.4.4.
+# Generated by GNU Autoconf 2.69 for shadowsocks-libev 2.4.5.
 #
 # Report bugs to <max.c.lv@gmail.com>.
 #
@@ -590,8 +590,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='shadowsocks-libev'
 PACKAGE_TARNAME='shadowsocks-libev'
-PACKAGE_VERSION='2.4.4'
-PACKAGE_STRING='shadowsocks-libev 2.4.4'
+PACKAGE_VERSION='2.4.5'
+PACKAGE_STRING='shadowsocks-libev 2.4.5'
 PACKAGE_BUGREPORT='max.c.lv@gmail.com'
 PACKAGE_URL=''
 
@@ -639,14 +639,14 @@ am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
 subdirs
-PTHREAD_CFLAGS
-PTHREAD_LIBS
-PTHREAD_CC
-ax_pthread_config
 BUILD_WINCOMPAT_FALSE
 BUILD_WINCOMPAT_TRUE
 BUILD_REDIRECTOR_FALSE
 BUILD_REDIRECTOR_TRUE
+PTHREAD_CFLAGS
+PTHREAD_LIBS
+PTHREAD_CC
+ax_pthread_config
 INET_NTOP_LIB
 USE_SYSTEM_SHARED_LIB_FALSE
 USE_SYSTEM_SHARED_LIB_TRUE
@@ -1346,7 +1346,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures shadowsocks-libev 2.4.4 to adapt to many kinds of systems.
+\`configure' configures shadowsocks-libev 2.4.5 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1417,7 +1417,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of shadowsocks-libev 2.4.4:";;
+     short | recursive ) echo "Configuration of shadowsocks-libev 2.4.5:";;
    esac
   cat <<\_ACEOF
 
@@ -1552,7 +1552,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-shadowsocks-libev configure 2.4.4
+shadowsocks-libev configure 2.4.5
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2075,7 +2075,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by shadowsocks-libev $as_me 2.4.4, which was
+It was created by shadowsocks-libev $as_me 2.4.5, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -4314,7 +4314,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='shadowsocks-libev'
- VERSION='2.4.4'
+ VERSION='2.4.5'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -13832,780 +13832,928 @@ $as_echo "transparent proxy does not support for $host" >&6; }
 esac
 
 
-ggl_check_stack_protector_save_CXXFLAGS="$CXXFLAGS"
-ggl_check_stack_protector_save_CFLAGS="$CFLAGS"
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if -fstack-protector and -fstack-protector-all are supported." >&5
-$as_echo_n "checking if -fstack-protector and -fstack-protector-all are supported.... " >&6; }
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
-CXXFLAGS="$CXXFLAGS -fstack-protector"
-CFLAGS="$CFLAGS -fstack-protector"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ax_pthread_ok=no
+
+# We used to check for pthread.h first, but this fails if pthread.h
+# requires special compiler flags (e.g. on True64 or Sequent).
+# It gets checked for in the link test anyway.
+
+# First of all, check if the user has set any of the PTHREAD_LIBS,
+# etcetera environment variables, and if threads linking works using
+# them:
+if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
+        save_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        save_LIBS="$LIBS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS" >&5
+$as_echo_n "checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS... " >&6; }
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
-int main() {
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char pthread_join ();
+int
+main ()
+{
+return pthread_join ();
+  ;
   return 0;
 }
-
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ggl_check_stack_protector_ok=yes
-else
-  ggl_check_stack_protector_ok=no
+if ac_fn_c_try_link "$LINENO"; then :
+  ax_pthread_ok=yes
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_ok" >&5
+$as_echo "$ax_pthread_ok" >&6; }
+        if test x"$ax_pthread_ok" = xno; then
+                PTHREAD_LIBS=""
+                PTHREAD_CFLAGS=""
+        fi
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
-CXXFLAGS="$ggl_check_stack_protector_save_CXXFLAGS -fstack-protector-all"
-CFLAGS="$ggl_check_stack_protector_save_CFLAGS -fstack-protector-all"
+# We must check for the threads library under a number of different
+# names; the ordering is very important because some systems
+# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
+# libraries is broken (non-POSIX).
+
+# Create a list of thread flags to try.  Items starting with a "-" are
+# C compiler flags, and other items are library names, except for "none"
+# which indicates that we try without any flags at all, and "pthread-config"
+# which is a program returning the flags for the Pth emulation library.
+
+ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+
+# The ordering *is* (sometimes) important.  Some notes on the
+# individual items follow:
+
+# pthreads: AIX (must check this before -lpthread)
+# none: in case threads are in libc; should be tried before -Kthread and
+#       other compiler flags to prevent continual compiler warnings
+# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
+# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
+# -pthreads: Solaris/gcc
+# -mthreads: Mingw32/gcc, Lynx/gcc
+# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
+#      doesn't hurt to check since this sometimes defines pthreads too;
+#      also defines -D_REENTRANT)
+#      ... -mt is also the pthreads flag for HP/aCC
+# pthread: Linux, etcetera
+# --thread-safe: KAI C++
+# pthread-config: use pthread-config program (for GNU Pth library)
+
+case ${host_os} in
+        solaris*)
+
+        # On Solaris (at least, for some versions), libc contains stubbed
+        # (non-functional) versions of the pthreads routines, so link-based
+        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
+        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
+        # a function called by this macro, so we could check for that, but
+        # who knows whether they'll stub that too in a future libc.)  So,
+        # we'll just look for -pthreads and -lpthread first:
+
+        ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
+        ;;
+esac
+
+# Clang doesn't consider unrecognized options an error unless we specify
+# -Werror. We throw in some extra Clang-specific options to ensure that
+# this doesn't happen for GCC, which also accepts -Werror.
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler needs -Werror to reject unknown flags" >&5
+$as_echo_n "checking if compiler needs -Werror to reject unknown flags... " >&6; }
+save_CFLAGS="$CFLAGS"
+ax_pthread_extra_flags="-Werror"
+CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
-int main() {
+int foo(void);
+int
+main ()
+{
+foo()
+  ;
   return 0;
 }
-
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ggl_check_stack_protector_all_ok=yes
-else
-  ggl_check_stack_protector_all_ok=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-
-if test "x$ggl_check_stack_protector_ok" = "xyes" -a \
-        "x$ggl_check_stack_protector_all_ok" = "xyes"; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-  has_stack_protector=yes
 else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+  ax_pthread_extra_flags=
+                   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-  has_stack_protector=no
 fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS="$save_CFLAGS"
 
-CXXFLAGS="$ggl_check_stack_protector_save_CXXFLAGS"
-CFLAGS="$ggl_check_stack_protector_save_CFLAGS"
-
+if test x"$ax_pthread_ok" = xno; then
+for flag in $ax_pthread_flags; do
 
-# XXX - disable -fstack-protector due to missing libssp_nonshared
-case "$host_os" in
-     *aix*)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on AIX" >&5
-$as_echo "$as_me: -fstack-protector disabled on AIX" >&6;}
-	has_stack_protector=no
-	;;
-     *sunos*)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on SunOS" >&5
-$as_echo "$as_me: -fstack-protector disabled on SunOS" >&6;}
-	has_stack_protector=no
-	;;
-     *solaris*)
-	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on Solaris" >&5
-$as_echo "$as_me: -fstack-protector disabled on Solaris" >&6;}
-	has_stack_protector=no
-	;;
-esac
+        case $flag in
+                none)
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work without any flags" >&5
+$as_echo_n "checking whether pthreads work without any flags... " >&6; }
+                ;;
 
-# Check whether --enable-ssp was given.
-if test "${enable_ssp+set}" = set; then :
-  enableval=$enable_ssp;
-  enable_ssp="no"
+                -*)
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work with $flag" >&5
+$as_echo_n "checking whether pthreads work with $flag... " >&6; }
+                PTHREAD_CFLAGS="$flag"
+                ;;
 
+                pthread-config)
+                # Extract the first word of "pthread-config", so it can be a program name with args.
+set dummy pthread-config; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ax_pthread_config+:} false; then :
+  $as_echo_n "(cached) " >&6
 else
+  if test -n "$ax_pthread_config"; then
+  ac_cv_prog_ax_pthread_config="$ax_pthread_config" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ax_pthread_config="yes"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
 
-  enable_ssp="yes"
-
-fi
-
-
-if test x$has_stack_protector = xyes && test x$enable_ssp = xyes; then
-   CFLAGS="$CFLAGS -fstack-protector"
-   { $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector enabled in CFLAGS" >&5
-$as_echo "$as_me: -fstack-protector enabled in CFLAGS" >&6;}
+  test -z "$ac_cv_prog_ax_pthread_config" && ac_cv_prog_ax_pthread_config="no"
 fi
-
- if test "$os_support" = "linux"; then
-  BUILD_REDIRECTOR_TRUE=
-  BUILD_REDIRECTOR_FALSE='#'
-else
-  BUILD_REDIRECTOR_TRUE='#'
-  BUILD_REDIRECTOR_FALSE=
 fi
-
- if test "$os_support" = "mingw"; then
-  BUILD_WINCOMPAT_TRUE=
-  BUILD_WINCOMPAT_FALSE='#'
+ax_pthread_config=$ac_cv_prog_ax_pthread_config
+if test -n "$ax_pthread_config"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_config" >&5
+$as_echo "$ax_pthread_config" >&6; }
 else
-  BUILD_WINCOMPAT_TRUE='#'
-  BUILD_WINCOMPAT_FALSE=
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
 
-for ac_header in limits.h stdint.h inttypes.h arpa/inet.h fcntl.h langinfo.h locale.h netdb.h netinet/in.h stdlib.h string.h strings.h unistd.h sys/ioctl.h
-do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
+                if test x"$ax_pthread_config" = xno; then continue; fi
+                PTHREAD_CFLAGS="`pthread-config --cflags`"
+                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
+                ;;
 
-done
+                *)
+                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the pthreads library -l$flag" >&5
+$as_echo_n "checking for the pthreads library -l$flag... " >&6; }
+                PTHREAD_LIBS="-l$flag"
+                ;;
+        esac
 
+        save_LIBS="$LIBS"
+        save_CFLAGS="$CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags"
 
-for ac_header in sys/socket.h
-do :
-  ac_fn_c_check_header_mongrel "$LINENO" "sys/socket.h" "ac_cv_header_sys_socket_h" "$ac_includes_default"
-if test "x$ac_cv_header_sys_socket_h" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_SYS_SOCKET_H 1
+        # Check for various functions.  We must include pthread.h,
+        # since some functions may be macros.  (On the Sequent, we
+        # need a special flag -Kthread to make this header compile.)
+        # We check for pthread_join because it is in -lpthread on IRIX
+        # while pthread_create is in libc.  We check for pthread_attr_init
+        # due to DEC craziness with -lpthreads.  We check for
+        # pthread_cleanup_push because it is one of the few pthread
+        # functions on Solaris that doesn't have a non-functional libc stub.
+        # We try pthread_create on general principles.
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <pthread.h>
+                        static void routine(void *a) { a = 0; }
+                        static void *start_routine(void *a) { return a; }
+int
+main ()
+{
+pthread_t th; pthread_attr_t attr;
+                        pthread_create(&th, 0, start_routine, 0);
+                        pthread_join(th, 0);
+                        pthread_attr_init(&attr);
+                        pthread_cleanup_push(routine, 0);
+                        pthread_cleanup_pop(0) /* ; */
+  ;
+  return 0;
+}
 _ACEOF
-
+if ac_fn_c_try_link "$LINENO"; then :
+  ax_pthread_ok=yes
 fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
 
-done
-
-for ac_header in net/if.h
-do :
-  ac_fn_c_check_header_compile "$LINENO" "net/if.h" "ac_cv_header_net_if_h" "
-#include <stdio.h>
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#else
-# ifdef HAVE_STDLIB_H
-#  include <stdlib.h>
-# endif
-#endif
-#ifdef HAVE_SYS_SOCKET_H
-# include <sys/socket.h>
-#endif
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
 
-"
-if test "x$ac_cv_header_net_if_h" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_NET_IF_H 1
-_ACEOF
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_ok" >&5
+$as_echo "$ax_pthread_ok" >&6; }
+        if test "x$ax_pthread_ok" = xyes; then
+                break;
+        fi
 
+        PTHREAD_LIBS=""
+        PTHREAD_CFLAGS=""
+done
 fi
 
-done
+# Various other checks:
+if test "x$ax_pthread_ok" = xyes; then
+        save_LIBS="$LIBS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        save_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 
+        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for joinable pthread attribute" >&5
+$as_echo_n "checking for joinable pthread attribute... " >&6; }
+        attr_name=unknown
+        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <pthread.h>
+int
+main ()
+{
+int attr = $attr; return attr /* ; */
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  attr_name=$attr; break
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+        done
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $attr_name" >&5
+$as_echo "$attr_name" >&6; }
+        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
 
-case $host in
-  *-mingw*)
-    for ac_header in windows.h winsock2.h ws2tcpip.h
-do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+cat >>confdefs.h <<_ACEOF
+#define PTHREAD_CREATE_JOINABLE $attr_name
 _ACEOF
 
-else
-  as_fn_error $? "Missing MinGW headers" "$LINENO" 5
-fi
+        fi
 
-done
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking if more special flags are required for pthreads" >&5
+$as_echo_n "checking if more special flags are required for pthreads... " >&6; }
+        flag=no
+        case ${host_os} in
+            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
+            osf* | hpux*) flag="-D_REENTRANT";;
+            solaris*)
+            if test "$GCC" = "yes"; then
+                flag="-D_REENTRANT"
+            else
+                # TODO: What about Clang on Solaris?
+                flag="-mt -D_REENTRANT"
+            fi
+            ;;
+        esac
+        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $flag" >&5
+$as_echo "$flag" >&6; }
+        if test "x$flag" != xno; then
+            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
+        fi
 
-    ;;
-  *-linux*)
-        for ac_header in linux/if.h linux/netfilter_ipv4.h linux/netfilter_ipv6/ip6_tables.h
-do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "
-    #if HAVE_LIMITS_H
-    #include <limits.h>
-    #endif
-    /* Netfilter ip(6)tables v1.4.0 has broken headers */
-    #if HAVE_NETINET_IN_H
-    #include <netinet/in.h>
-    #endif
-    #if HAVE_LINUX_IF_H
-    #include <net/if.h>
-    #endif
-    #if HAVE_SYS_SOCKET_H
-    #include <sys/socket.h>
-    #endif
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PTHREAD_PRIO_INHERIT" >&5
+$as_echo_n "checking for PTHREAD_PRIO_INHERIT... " >&6; }
+if ${ax_cv_PTHREAD_PRIO_INHERIT+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
 
-"
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+                cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <pthread.h>
+int
+main ()
+{
+int i = PTHREAD_PRIO_INHERIT;
+  ;
+  return 0;
+}
 _ACEOF
-
+if ac_fn_c_try_link "$LINENO"; then :
+  ax_cv_PTHREAD_PRIO_INHERIT=yes
 else
-  as_fn_error $? "Missing netfilter headers" "$LINENO" 5
+  ax_cv_PTHREAD_PRIO_INHERIT=no
 fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
 
-done
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_PTHREAD_PRIO_INHERIT" >&5
+$as_echo "$ax_cv_PTHREAD_PRIO_INHERIT" >&6; }
+        if test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"; then :
 
-    ;;
-  *)
-    # These are POSIX-like systems using BSD-like sockets API.
-    ;;
-esac
+$as_echo "#define HAVE_PTHREAD_PRIO_INHERIT 1" >>confdefs.h
 
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether byte ordering is bigendian" >&5
-$as_echo_n "checking whether byte ordering is bigendian... " >&6; }
-if ${ac_cv_c_bigendian+:} false; then :
+fi
+
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
+
+        # More AIX lossage: compile with *_r variant
+        if test "x$GCC" != xyes; then
+            case $host_os in
+                aix*)
+                case "x/$CC" in #(
+  x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6) :
+    #handle absolute path differently from PATH based program lookup
+                   case "x$CC" in #(
+  x/*) :
+    if as_fn_executable_p ${CC}_r; then :
+  PTHREAD_CC="${CC}_r"
+fi ;; #(
+  *) :
+    for ac_prog in ${CC}_r
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_PTHREAD_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_cv_c_bigendian=unknown
-    # See if we're dealing with a universal compiler.
-    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#ifndef __APPLE_CC__
-	       not a universal capable compiler
-	     #endif
-	     typedef int dummy;
-
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
+  if test -n "$PTHREAD_CC"; then
+  ac_cv_prog_PTHREAD_CC="$PTHREAD_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_prog_PTHREAD_CC="$ac_prog"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
 
-	# Check for potential -arch flags.  It is not universal unless
-	# there are at least two -arch flags with different values.
-	ac_arch=
-	ac_prev=
-	for ac_word in $CC $CFLAGS $CPPFLAGS $LDFLAGS; do
-	 if test -n "$ac_prev"; then
-	   case $ac_word in
-	     i?86 | x86_64 | ppc | ppc64)
-	       if test -z "$ac_arch" || test "$ac_arch" = "$ac_word"; then
-		 ac_arch=$ac_word
-	       else
-		 ac_cv_c_bigendian=universal
-		 break
-	       fi
-	       ;;
-	   esac
-	   ac_prev=
-	 elif test "x$ac_word" = "x-arch"; then
-	   ac_prev=arch
-	 fi
-       done
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-    if test $ac_cv_c_bigendian = unknown; then
-      # See if sys/param.h defines the BYTE_ORDER macro.
-      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <sys/types.h>
-	     #include <sys/param.h>
+fi
+PTHREAD_CC=$ac_cv_prog_PTHREAD_CC
+if test -n "$PTHREAD_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PTHREAD_CC" >&5
+$as_echo "$PTHREAD_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
 
-int
-main ()
-{
-#if ! (defined BYTE_ORDER && defined BIG_ENDIAN \
-		     && defined LITTLE_ENDIAN && BYTE_ORDER && BIG_ENDIAN \
-		     && LITTLE_ENDIAN)
-	      bogus endian macros
-	     #endif
 
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  # It does; now see whether it defined to BIG_ENDIAN or not.
-	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <sys/types.h>
-		#include <sys/param.h>
+  test -n "$PTHREAD_CC" && break
+done
+test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
+ ;;
+esac ;; #(
+  *) :
+     ;;
+esac
+                ;;
+            esac
+        fi
+fi
 
-int
-main ()
-{
-#if BYTE_ORDER != BIG_ENDIAN
-		 not big endian
-		#endif
+test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
 
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_c_bigendian=yes
+
+
+
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test x"$ax_pthread_ok" = xyes; then
+        LIBS="$PTHREAD_LIBS $LIBS"
+            CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+            CC="$PTHREAD_CC"
+        :
 else
-  ac_cv_c_bigendian=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+        ax_pthread_ok=no
+        as_fn_error $? "Can not find pthreads.  This is required." "$LINENO" 5
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-    fi
-    if test $ac_cv_c_bigendian = unknown; then
-      # See if <limits.h> defines _LITTLE_ENDIAN or _BIG_ENDIAN (e.g., Solaris).
-      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <limits.h>
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
-int
-main ()
-{
-#if ! (defined _LITTLE_ENDIAN || defined _BIG_ENDIAN)
-	      bogus endian macros
-	     #endif
 
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  # It does; now see whether it defined to _BIG_ENDIAN or not.
-	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <limits.h>
 
-int
-main ()
-{
-#ifndef _BIG_ENDIAN
-		 not big endian
-		#endif
 
-  ;
+ggl_check_stack_protector_save_CXXFLAGS="$CXXFLAGS"
+ggl_check_stack_protector_save_CFLAGS="$CFLAGS"
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if -fstack-protector and -fstack-protector-all are supported." >&5
+$as_echo_n "checking if -fstack-protector and -fstack-protector-all are supported.... " >&6; }
+
+CXXFLAGS="$CXXFLAGS -fstack-protector"
+CFLAGS="$CFLAGS -fstack-protector"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int main() {
   return 0;
 }
+
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_c_bigendian=yes
+  ggl_check_stack_protector_ok=yes
 else
-  ac_cv_c_bigendian=no
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  ggl_check_stack_protector_ok=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-    fi
-    if test $ac_cv_c_bigendian = unknown; then
-      # Compile a test program.
-      if test "$cross_compiling" = yes; then :
-  # Try to guess by grepping values from an object file.
-	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+
+CXXFLAGS="$ggl_check_stack_protector_save_CXXFLAGS -fstack-protector-all"
+CFLAGS="$ggl_check_stack_protector_save_CFLAGS -fstack-protector-all"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-short int ascii_mm[] =
-		  { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
-		short int ascii_ii[] =
-		  { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
-		int use_ascii (int i) {
-		  return ascii_mm[i] + ascii_ii[i];
-		}
-		short int ebcdic_ii[] =
-		  { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
-		short int ebcdic_mm[] =
-		  { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
-		int use_ebcdic (int i) {
-		  return ebcdic_mm[i] + ebcdic_ii[i];
-		}
-		extern int foo;
 
-int
-main ()
-{
-return use_ascii (foo) == use_ebcdic (foo);
-  ;
+int main() {
   return 0;
 }
+
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  if grep BIGenDianSyS conftest.$ac_objext >/dev/null; then
-	      ac_cv_c_bigendian=yes
-	    fi
-	    if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
-	      if test "$ac_cv_c_bigendian" = unknown; then
-		ac_cv_c_bigendian=no
-	      else
-		# finding both strings is unlikely to happen, but who knows?
-		ac_cv_c_bigendian=unknown
-	      fi
-	    fi
+  ggl_check_stack_protector_all_ok=yes
+else
+  ggl_check_stack_protector_all_ok=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+if test "x$ggl_check_stack_protector_ok" = "xyes" -a \
+        "x$ggl_check_stack_protector_all_ok" = "xyes"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+  has_stack_protector=yes
 else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-$ac_includes_default
-int
-main ()
-{
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+  has_stack_protector=no
+fi
 
-	     /* Are we little or big endian?  From Harbison&Steele.  */
-	     union
-	     {
-	       long int l;
-	       char c[sizeof (long int)];
-	     } u;
-	     u.l = 1;
-	     return u.c[sizeof (long int) - 1] == 1;
+CXXFLAGS="$ggl_check_stack_protector_save_CXXFLAGS"
+CFLAGS="$ggl_check_stack_protector_save_CFLAGS"
+
+
+# XXX - disable -fstack-protector due to missing libssp_nonshared
+case "$host_os" in
+     *aix*)
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on AIX" >&5
+$as_echo "$as_me: -fstack-protector disabled on AIX" >&6;}
+	has_stack_protector=no
+	;;
+     *sunos*)
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on SunOS" >&5
+$as_echo "$as_me: -fstack-protector disabled on SunOS" >&6;}
+	has_stack_protector=no
+	;;
+     *solaris*)
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector disabled on Solaris" >&5
+$as_echo "$as_me: -fstack-protector disabled on Solaris" >&6;}
+	has_stack_protector=no
+	;;
+esac
+
+# Check whether --enable-ssp was given.
+if test "${enable_ssp+set}" = set; then :
+  enableval=$enable_ssp;
+  enable_ssp="no"
 
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  ac_cv_c_bigendian=no
 else
-  ac_cv_c_bigendian=yes
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
 
-    fi
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_bigendian" >&5
-$as_echo "$ac_cv_c_bigendian" >&6; }
- case $ac_cv_c_bigendian in #(
-   yes)
-     $as_echo "#define WORDS_BIGENDIAN 1" >>confdefs.h
-;; #(
-   no)
-      ;; #(
-   universal)
+  enable_ssp="yes"
 
-$as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
+fi
 
-     ;; #(
-   *)
-     as_fn_error $? "unknown endianness
- presetting ac_cv_c_bigendian=no (or yes) will help" "$LINENO" 5 ;;
- esac
 
+if test x$has_stack_protector = xyes && test x$enable_ssp = xyes; then
+   CFLAGS="$CFLAGS -fstack-protector"
+   { $as_echo "$as_me:${as_lineno-$LINENO}: -fstack-protector enabled in CFLAGS" >&5
+$as_echo "$as_me: -fstack-protector enabled in CFLAGS" >&6;}
+fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
-$as_echo_n "checking for inline... " >&6; }
-if ${ac_cv_c_inline+:} false; then :
-  $as_echo_n "(cached) " >&6
+ if test "$os_support" = "linux"; then
+  BUILD_REDIRECTOR_TRUE=
+  BUILD_REDIRECTOR_FALSE='#'
 else
-  ac_cv_c_inline=no
-for ac_kw in inline __inline__ __inline; do
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#ifndef __cplusplus
-typedef int foo_t;
-static $ac_kw foo_t static_foo () {return 0; }
-$ac_kw foo_t foo () {return 0; }
-#endif
-
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_c_inline=$ac_kw
+  BUILD_REDIRECTOR_TRUE='#'
+  BUILD_REDIRECTOR_FALSE=
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-  test "$ac_cv_c_inline" != no && break
-done
 
+ if test "$os_support" = "mingw"; then
+  BUILD_WINCOMPAT_TRUE=
+  BUILD_WINCOMPAT_FALSE='#'
+else
+  BUILD_WINCOMPAT_TRUE='#'
+  BUILD_WINCOMPAT_FALSE=
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_inline" >&5
-$as_echo "$ac_cv_c_inline" >&6; }
 
-case $ac_cv_c_inline in
-  inline | yes) ;;
-  *)
-    case $ac_cv_c_inline in
-      no) ac_val=;;
-      *) ac_val=$ac_cv_c_inline;;
-    esac
-    cat >>confdefs.h <<_ACEOF
-#ifndef __cplusplus
-#define inline $ac_val
-#endif
+
+for ac_header in limits.h stdint.h inttypes.h arpa/inet.h fcntl.h langinfo.h locale.h netdb.h netinet/in.h stdlib.h string.h strings.h unistd.h sys/ioctl.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
 _ACEOF
-    ;;
-esac
 
-ac_fn_c_check_type "$LINENO" "ssize_t" "ac_cv_type_ssize_t" "$ac_includes_default"
-if test "x$ac_cv_type_ssize_t" = xyes; then :
+fi
 
-else
+done
 
-cat >>confdefs.h <<_ACEOF
-#define ssize_t int
+
+for ac_header in sys/socket.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "sys/socket.h" "ac_cv_header_sys_socket_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_socket_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_SYS_SOCKET_H 1
 _ACEOF
 
 fi
 
+done
 
+for ac_header in net/if.h
+do :
+  ac_fn_c_check_header_compile "$LINENO" "net/if.h" "ac_cv_header_net_if_h" "
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
 
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable assertions" >&5
-$as_echo_n "checking whether to enable assertions... " >&6; }
-  # Check whether --enable-assert was given.
-if test "${enable_assert+set}" = set; then :
-  enableval=$enable_assert; ac_enable_assert=$enableval
-     if       test "x$enableval" = xno; then :
-
-$as_echo "#define NDEBUG 1" >>confdefs.h
+"
+if test "x$ac_cv_header_net_if_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_NET_IF_H 1
+_ACEOF
 
-elif test "x$enableval" != xyes; then :
-  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: invalid argument supplied to --enable-assert" >&5
-$as_echo "$as_me: WARNING: invalid argument supplied to --enable-assert" >&2;}
-	ac_enable_assert=yes
-fi
-else
-  ac_enable_assert=yes
 fi
 
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_enable_assert" >&5
-$as_echo "$ac_enable_assert" >&6; }
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
-$as_echo_n "checking for ANSI C header files... " >&6; }
-if ${ac_cv_header_stdc+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <float.h>
+done
 
-int
-main ()
-{
 
-  ;
-  return 0;
-}
+case $host in
+  *-mingw*)
+    for ac_header in windows.h winsock2.h ws2tcpip.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_header_stdc=yes
+
 else
-  ac_cv_header_stdc=no
+  as_fn_error $? "Missing MinGW headers" "$LINENO" 5
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
-if test $ac_cv_header_stdc = yes; then
-  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <string.h>
+done
+
+    ;;
+  *-linux*)
+        for ac_header in linux/if.h linux/netfilter_ipv4.h linux/netfilter_ipv6/ip6_tables.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "
+    #if HAVE_LIMITS_H
+    #include <limits.h>
+    #endif
+    /* Netfilter ip(6)tables v1.4.0 has broken headers */
+    #if HAVE_NETINET_IN_H
+    #include <netinet/in.h>
+    #endif
+    #if HAVE_LINUX_IF_H
+    #include <net/if.h>
+    #endif
+    #if HAVE_SYS_SOCKET_H
+    #include <sys/socket.h>
+    #endif
 
+"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
 _ACEOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  $EGREP "memchr" >/dev/null 2>&1; then :
 
 else
-  ac_cv_header_stdc=no
+  as_fn_error $? "Missing netfilter headers" "$LINENO" 5
 fi
-rm -f conftest*
 
-fi
+done
 
-if test $ac_cv_header_stdc = yes; then
-  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+    ;;
+  *)
+    # These are POSIX-like systems using BSD-like sockets API.
+    ;;
+esac
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether byte ordering is bigendian" >&5
+$as_echo_n "checking whether byte ordering is bigendian... " >&6; }
+if ${ac_cv_c_bigendian+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_c_bigendian=unknown
+    # See if we're dealing with a universal compiler.
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <stdlib.h>
+#ifndef __APPLE_CC__
+	       not a universal capable compiler
+	     #endif
+	     typedef int dummy;
 
 _ACEOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  $EGREP "free" >/dev/null 2>&1; then :
+if ac_fn_c_try_compile "$LINENO"; then :
 
-else
-  ac_cv_header_stdc=no
+	# Check for potential -arch flags.  It is not universal unless
+	# there are at least two -arch flags with different values.
+	ac_arch=
+	ac_prev=
+	for ac_word in $CC $CFLAGS $CPPFLAGS $LDFLAGS; do
+	 if test -n "$ac_prev"; then
+	   case $ac_word in
+	     i?86 | x86_64 | ppc | ppc64)
+	       if test -z "$ac_arch" || test "$ac_arch" = "$ac_word"; then
+		 ac_arch=$ac_word
+	       else
+		 ac_cv_c_bigendian=universal
+		 break
+	       fi
+	       ;;
+	   esac
+	   ac_prev=
+	 elif test "x$ac_word" = "x-arch"; then
+	   ac_prev=arch
+	 fi
+       done
 fi
-rm -f conftest*
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    if test $ac_cv_c_bigendian = unknown; then
+      # See if sys/param.h defines the BYTE_ORDER macro.
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/types.h>
+	     #include <sys/param.h>
 
-fi
+int
+main ()
+{
+#if ! (defined BYTE_ORDER && defined BIG_ENDIAN \
+		     && defined LITTLE_ENDIAN && BYTE_ORDER && BIG_ENDIAN \
+		     && LITTLE_ENDIAN)
+	      bogus endian macros
+	     #endif
 
-if test $ac_cv_header_stdc = yes; then
-  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
-  if test "$cross_compiling" = yes; then :
-  :
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  # It does; now see whether it defined to BIG_ENDIAN or not.
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <ctype.h>
-#include <stdlib.h>
-#if ((' ' & 0x0FF) == 0x020)
-# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
-# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
-#else
-# define ISLOWER(c) \
-		   (('a' <= (c) && (c) <= 'i') \
-		     || ('j' <= (c) && (c) <= 'r') \
-		     || ('s' <= (c) && (c) <= 'z'))
-# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
-#endif
+#include <sys/types.h>
+		#include <sys/param.h>
 
-#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
 int
 main ()
 {
-  int i;
-  for (i = 0; i < 256; i++)
-    if (XOR (islower (i), ISLOWER (i))
-	|| toupper (i) != TOUPPER (i))
-      return 2;
+#if BYTE_ORDER != BIG_ENDIAN
+		 not big endian
+		#endif
+
+  ;
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_c_bigendian=yes
 else
-  ac_cv_header_stdc=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
+  ac_cv_c_bigendian=no
 fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
-$as_echo "$ac_cv_header_stdc" >&6; }
-if test $ac_cv_header_stdc = yes; then
-
-$as_echo "#define STDC_HEADERS 1" >>confdefs.h
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    fi
+    if test $ac_cv_c_bigendian = unknown; then
+      # See if <limits.h> defines _LITTLE_ENDIAN or _BIG_ENDIAN (e.g., Solaris).
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <limits.h>
 
-fi
+int
+main ()
+{
+#if ! (defined _LITTLE_ENDIAN || defined _BIG_ENDIAN)
+	      bogus endian macros
+	     #endif
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sys/wait.h that is POSIX.1 compatible" >&5
-$as_echo_n "checking for sys/wait.h that is POSIX.1 compatible... " >&6; }
-if ${ac_cv_header_sys_wait_h+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  # It does; now see whether it defined to _BIG_ENDIAN or not.
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <sys/types.h>
-#include <sys/wait.h>
-#ifndef WEXITSTATUS
-# define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
-#endif
-#ifndef WIFEXITED
-# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
-#endif
+#include <limits.h>
 
 int
 main ()
 {
-  int s;
-  wait (&s);
-  s = WIFEXITED (s) ? WEXITSTATUS (s) : 1;
+#ifndef _BIG_ENDIAN
+		 not big endian
+		#endif
+
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_header_sys_wait_h=yes
+  ac_cv_c_bigendian=yes
 else
-  ac_cv_header_sys_wait_h=no
+  ac_cv_c_bigendian=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_sys_wait_h" >&5
-$as_echo "$ac_cv_header_sys_wait_h" >&6; }
-if test $ac_cv_header_sys_wait_h = yes; then
-
-$as_echo "#define HAVE_SYS_WAIT_H 1" >>confdefs.h
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+    fi
+    if test $ac_cv_c_bigendian = unknown; then
+      # Compile a test program.
+      if test "$cross_compiling" = yes; then :
+  # Try to guess by grepping values from an object file.
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+short int ascii_mm[] =
+		  { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+		short int ascii_ii[] =
+		  { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+		int use_ascii (int i) {
+		  return ascii_mm[i] + ascii_ii[i];
+		}
+		short int ebcdic_ii[] =
+		  { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+		short int ebcdic_mm[] =
+		  { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+		int use_ebcdic (int i) {
+		  return ebcdic_mm[i] + ebcdic_ii[i];
+		}
+		extern int foo;
 
+int
+main ()
+{
+return use_ascii (foo) == use_ebcdic (foo);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  if grep BIGenDianSyS conftest.$ac_objext >/dev/null; then
+	      ac_cv_c_bigendian=yes
+	    fi
+	    if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
+	      if test "$ac_cv_c_bigendian" = unknown; then
+		ac_cv_c_bigendian=no
+	      else
+		# finding both strings is unlikely to happen, but who knows?
+		ac_cv_c_bigendian=unknown
+	      fi
+	    fi
 fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for an ANSI C-conforming const" >&5
-$as_echo_n "checking for an ANSI C-conforming const... " >&6; }
-if ${ac_cv_c_const+:} false; then :
-  $as_echo_n "(cached) " >&6
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
+$ac_includes_default
 int
 main ()
 {
 
-#ifndef __cplusplus
-  /* Ultrix mips cc rejects this sort of thing.  */
-  typedef int charset[2];
-  const charset cs = { 0, 0 };
-  /* SunOS 4.1.1 cc rejects this.  */
-  char const *const *pcpcc;
-  char **ppc;
-  /* NEC SVR4.0.2 mips cc rejects this.  */
-  struct point {int x, y;};
-  static struct point const zero = {0,0};
-  /* AIX XL C 1.02.0.0 rejects this.
-     It does not let you subtract one const X* pointer from another in
-     an arm of an if-expression whose if-part is not a constant
-     expression */
-  const char *g = "string";
-  pcpcc = &g + (g ? g-g : 0);
-  /* HPUX 7.0 cc rejects these. */
-  ++pcpcc;
-  ppc = (char**) pcpcc;
-  pcpcc = (char const *const *) ppc;
-  { /* SCO 3.2v4 cc rejects this sort of thing.  */
-    char tx;
-    char *t = &tx;
-    char const *s = 0 ? (char *) 0 : (char const *) 0;
-
-    *t++ = 0;
-    if (s) return 0;
-  }
-  { /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
-    int x[] = {25, 17};
-    const int *foo = &x[0];
-    ++foo;
-  }
-  { /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
-    typedef const int *iptr;
-    iptr p = 0;
-    ++p;
-  }
-  { /* AIX XL C 1.02.0.0 rejects this sort of thing, saying
-       "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
-    struct s { int j; const int *ap[3]; } bx;
-    struct s *b = &bx; b->j = 5;
-  }
-  { /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
-    const int foo = 10;
-    if (!foo) return 0;
-  }
-  return !cs[0] && !zero.x;
-#endif
+	     /* Are we little or big endian?  From Harbison&Steele.  */
+	     union
+	     {
+	       long int l;
+	       char c[sizeof (long int)];
+	     } u;
+	     u.l = 1;
+	     return u.c[sizeof (long int) - 1] == 1;
 
   ;
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_c_const=yes
+if ac_fn_c_try_run "$LINENO"; then :
+  ac_cv_c_bigendian=no
 else
-  ac_cv_c_const=no
+  ac_cv_c_bigendian=yes
 fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_const" >&5
-$as_echo "$ac_cv_c_const" >&6; }
-if test $ac_cv_c_const = no; then
-
-$as_echo "#define const /**/" >>confdefs.h
 
+    fi
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_bigendian" >&5
+$as_echo "$ac_cv_c_bigendian" >&6; }
+ case $ac_cv_c_bigendian in #(
+   yes)
+     $as_echo "#define WORDS_BIGENDIAN 1" >>confdefs.h
+;; #(
+   no)
+      ;; #(
+   universal)
 
-ac_fn_c_check_type "$LINENO" "pid_t" "ac_cv_type_pid_t" "$ac_includes_default"
-if test "x$ac_cv_type_pid_t" = xyes; then :
-
-else
-
-cat >>confdefs.h <<_ACEOF
-#define pid_t int
-_ACEOF
+$as_echo "#define AC_APPLE_UNIVERSAL_BUILD 1" >>confdefs.h
 
-fi
+     ;; #(
+   *)
+     as_fn_error $? "unknown endianness
+ presetting ac_cv_c_bigendian=no (or yes) will help" "$LINENO" 5 ;;
+ esac
 
-ac_fn_c_check_type "$LINENO" "size_t" "ac_cv_type_size_t" "$ac_includes_default"
-if test "x$ac_cv_type_size_t" = xyes; then :
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
+$as_echo_n "checking for inline... " >&6; }
+if ${ac_cv_c_inline+:} false; then :
+  $as_echo_n "(cached) " >&6
 else
+  ac_cv_c_inline=no
+for ac_kw in inline __inline__ __inline; do
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifndef __cplusplus
+typedef int foo_t;
+static $ac_kw foo_t static_foo () {return 0; }
+$ac_kw foo_t foo () {return 0; }
+#endif
 
-cat >>confdefs.h <<_ACEOF
-#define size_t unsigned int
 _ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_c_inline=$ac_kw
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+  test "$ac_cv_c_inline" != no && break
+done
 
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_inline" >&5
+$as_echo "$ac_cv_c_inline" >&6; }
+
+case $ac_cv_c_inline in
+  inline | yes) ;;
+  *)
+    case $ac_cv_c_inline in
+      no) ac_val=;;
+      *) ac_val=$ac_cv_c_inline;;
+    esac
+    cat >>confdefs.h <<_ACEOF
+#ifndef __cplusplus
+#define inline $ac_val
+#endif
+_ACEOF
+    ;;
+esac
 
 ac_fn_c_check_type "$LINENO" "ssize_t" "ac_cv_type_ssize_t" "$ac_includes_default"
 if test "x$ac_cv_type_ssize_t" = xyes; then :
@@ -14618,390 +14766,372 @@ _ACEOF
 
 fi
 
-ac_fn_c_find_uintX_t "$LINENO" "16" "ac_cv_c_uint16_t"
-case $ac_cv_c_uint16_t in #(
-  no|yes) ;; #(
-  *)
-
 
-cat >>confdefs.h <<_ACEOF
-#define uint16_t $ac_cv_c_uint16_t
-_ACEOF
-;;
-  esac
 
-ac_fn_c_find_uintX_t "$LINENO" "8" "ac_cv_c_uint8_t"
-case $ac_cv_c_uint8_t in #(
-  no|yes) ;; #(
-  *)
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to enable assertions" >&5
+$as_echo_n "checking whether to enable assertions... " >&6; }
+  # Check whether --enable-assert was given.
+if test "${enable_assert+set}" = set; then :
+  enableval=$enable_assert; ac_enable_assert=$enableval
+     if       test "x$enableval" = xno; then :
 
-$as_echo "#define _UINT8_T 1" >>confdefs.h
+$as_echo "#define NDEBUG 1" >>confdefs.h
 
+elif test "x$enableval" != xyes; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: invalid argument supplied to --enable-assert" >&5
+$as_echo "$as_me: WARNING: invalid argument supplied to --enable-assert" >&2;}
+	ac_enable_assert=yes
+fi
+else
+  ac_enable_assert=yes
+fi
 
-cat >>confdefs.h <<_ACEOF
-#define uint8_t $ac_cv_c_uint8_t
-_ACEOF
-;;
-  esac
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_enable_assert" >&5
+$as_echo "$ac_enable_assert" >&6; }
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether time.h and sys/time.h may both be included" >&5
-$as_echo_n "checking whether time.h and sys/time.h may both be included... " >&6; }
-if ${ac_cv_header_time+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
+$as_echo_n "checking for ANSI C header files... " >&6; }
+if ${ac_cv_header_stdc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <sys/types.h>
-#include <sys/time.h>
-#include <time.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
 
 int
 main ()
 {
-if ((struct tm *) 0)
-return 0;
+
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_header_time=yes
+  ac_cv_header_stdc=yes
 else
-  ac_cv_header_time=no
+  ac_cv_header_stdc=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_time" >&5
-$as_echo "$ac_cv_header_time" >&6; }
-if test $ac_cv_header_time = yes; then
-
-$as_echo "#define TIME_WITH_SYS_TIME 1" >>confdefs.h
-
-fi
-
-
-for ac_header in vfork.h
-do :
-  ac_fn_c_check_header_mongrel "$LINENO" "vfork.h" "ac_cv_header_vfork_h" "$ac_includes_default"
-if test "x$ac_cv_header_vfork_h" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_VFORK_H 1
-_ACEOF
-
-fi
-
-done
-
-for ac_func in fork vfork
-do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
 
-if test "x$ac_cv_func_fork" = xyes; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working fork" >&5
-$as_echo_n "checking for working fork... " >&6; }
-if ${ac_cv_func_fork_works+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test "$cross_compiling" = yes; then :
-  ac_cv_func_fork_works=cross
-else
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-$ac_includes_default
-int
-main ()
-{
-
-	  /* By Ruediger Kuhlmann. */
-	  return fork () < 0;
+#include <string.h>
 
-  ;
-  return 0;
-}
 _ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  ac_cv_func_fork_works=yes
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "memchr" >/dev/null 2>&1; then :
+
 else
-  ac_cv_func_fork_works=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
+  ac_cv_header_stdc=no
 fi
+rm -f conftest*
 
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_fork_works" >&5
-$as_echo "$ac_cv_func_fork_works" >&6; }
 
-else
-  ac_cv_func_fork_works=$ac_cv_func_fork
-fi
-if test "x$ac_cv_func_fork_works" = xcross; then
-  case $host in
-    *-*-amigaos* | *-*-msdosdjgpp*)
-      # Override, as these systems have only a dummy fork() stub
-      ac_cv_func_fork_works=no
-      ;;
-    *)
-      ac_cv_func_fork_works=yes
-      ;;
-  esac
-  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: result $ac_cv_func_fork_works guessed because of cross compilation" >&5
-$as_echo "$as_me: WARNING: result $ac_cv_func_fork_works guessed because of cross compilation" >&2;}
-fi
-ac_cv_func_vfork_works=$ac_cv_func_vfork
-if test "x$ac_cv_func_vfork" = xyes; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working vfork" >&5
-$as_echo_n "checking for working vfork... " >&6; }
-if ${ac_cv_func_vfork_works+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test "$cross_compiling" = yes; then :
-  ac_cv_func_vfork_works=cross
-else
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-/* Thanks to Paul Eggert for this test.  */
-$ac_includes_default
-#include <sys/wait.h>
-#ifdef HAVE_VFORK_H
-# include <vfork.h>
-#endif
-/* On some sparc systems, changes by the child to local and incoming
-   argument registers are propagated back to the parent.  The compiler
-   is told about this with #include <vfork.h>, but some compilers
-   (e.g. gcc -O) don't grok <vfork.h>.  Test for this by using a
-   static variable whose address is put into a register that is
-   clobbered by the vfork.  */
-static void
-#ifdef __cplusplus
-sparc_address_test (int arg)
-# else
-sparc_address_test (arg) int arg;
-#endif
-{
-  static pid_t child;
-  if (!child) {
-    child = vfork ();
-    if (child < 0) {
-      perror ("vfork");
-      _exit(2);
-    }
-    if (!child) {
-      arg = getpid();
-      write(-1, "", 0);
-      _exit (arg);
-    }
-  }
-}
-
-int
-main ()
-{
-  pid_t parent = getpid ();
-  pid_t child;
-
-  sparc_address_test (0);
-
-  child = vfork ();
-
-  if (child == 0) {
-    /* Here is another test for sparc vfork register problems.  This
-       test uses lots of local variables, at least as many local
-       variables as main has allocated so far including compiler
-       temporaries.  4 locals are enough for gcc 1.40.3 on a Solaris
-       4.1.3 sparc, but we use 8 to be safe.  A buggy compiler should
-       reuse the register of parent for one of the local variables,
-       since it will think that parent can't possibly be used any more
-       in this routine.  Assigning to the local variable will thus
-       munge parent in the parent process.  */
-    pid_t
-      p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(),
-      p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid();
-    /* Convince the compiler that p..p7 are live; otherwise, it might
-       use the same hardware register for all 8 local variables.  */
-    if (p != p1 || p != p2 || p != p3 || p != p4
-	|| p != p5 || p != p6 || p != p7)
-      _exit(1);
-
-    /* On some systems (e.g. IRIX 3.3), vfork doesn't separate parent
-       from child file descriptors.  If the child closes a descriptor
-       before it execs or exits, this munges the parent's descriptor
-       as well.  Test for this by closing stdout in the child.  */
-    _exit(close(fileno(stdout)) != 0);
-  } else {
-    int status;
-    struct stat st;
+#include <stdlib.h>
 
-    while (wait(&status) != child)
-      ;
-    return (
-	 /* Was there some problem with vforking?  */
-	 child < 0
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "free" >/dev/null 2>&1; then :
 
-	 /* Did the child fail?  (This shouldn't happen.)  */
-	 || status
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
 
-	 /* Did the vfork/compiler bug occur?  */
-	 || parent != getpid()
+fi
 
-	 /* Did the file descriptor bug occur?  */
-	 || fstat(fileno(stdout), &st) != 0
-	 );
-  }
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+  if test "$cross_compiling" = yes; then :
+  :
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ctype.h>
+#include <stdlib.h>
+#if ((' ' & 0x0FF) == 0x020)
+# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#else
+# define ISLOWER(c) \
+		   (('a' <= (c) && (c) <= 'i') \
+		     || ('j' <= (c) && (c) <= 'r') \
+		     || ('s' <= (c) && (c) <= 'z'))
+# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
+#endif
+
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    if (XOR (islower (i), ISLOWER (i))
+	|| toupper (i) != TOUPPER (i))
+      return 2;
+  return 0;
 }
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  ac_cv_func_vfork_works=yes
+
 else
-  ac_cv_func_vfork_works=no
+  ac_cv_header_stdc=no
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
   conftest.$ac_objext conftest.beam conftest.$ac_ext
 fi
 
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_vfork_works" >&5
-$as_echo "$ac_cv_func_vfork_works" >&6; }
-
-fi;
-if test "x$ac_cv_func_fork_works" = xcross; then
-  ac_cv_func_vfork_works=$ac_cv_func_vfork
-  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: result $ac_cv_func_vfork_works guessed because of cross compilation" >&5
-$as_echo "$as_me: WARNING: result $ac_cv_func_vfork_works guessed because of cross compilation" >&2;}
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
+$as_echo "$ac_cv_header_stdc" >&6; }
+if test $ac_cv_header_stdc = yes; then
 
-if test "x$ac_cv_func_vfork_works" = xyes; then
+$as_echo "#define STDC_HEADERS 1" >>confdefs.h
 
-$as_echo "#define HAVE_WORKING_VFORK 1" >>confdefs.h
+fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sys/wait.h that is POSIX.1 compatible" >&5
+$as_echo_n "checking for sys/wait.h that is POSIX.1 compatible... " >&6; }
+if ${ac_cv_header_sys_wait_h+:} false; then :
+  $as_echo_n "(cached) " >&6
 else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <sys/types.h>
+#include <sys/wait.h>
+#ifndef WEXITSTATUS
+# define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
+#endif
+#ifndef WIFEXITED
+# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
+#endif
 
-$as_echo "#define vfork fork" >>confdefs.h
-
+int
+main ()
+{
+  int s;
+  wait (&s);
+  s = WIFEXITED (s) ? WEXITSTATUS (s) : 1;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_header_sys_wait_h=yes
+else
+  ac_cv_header_sys_wait_h=no
 fi
-if test "x$ac_cv_func_fork_works" = xyes; then
-
-$as_echo "#define HAVE_WORKING_FORK 1" >>confdefs.h
-
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_sys_wait_h" >&5
+$as_echo "$ac_cv_header_sys_wait_h" >&6; }
+if test $ac_cv_header_sys_wait_h = yes; then
 
-for ac_header in sys/select.h sys/socket.h
-do :
-  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
-ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
-if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
+$as_echo "#define HAVE_SYS_WAIT_H 1" >>confdefs.h
 
 fi
 
-done
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking types of arguments for select" >&5
-$as_echo_n "checking types of arguments for select... " >&6; }
-if ${ac_cv_func_select_args+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for an ANSI C-conforming const" >&5
+$as_echo_n "checking for an ANSI C-conforming const... " >&6; }
+if ${ac_cv_c_const+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  for ac_arg234 in 'fd_set *' 'int *' 'void *'; do
- for ac_arg1 in 'int' 'size_t' 'unsigned long int' 'unsigned int'; do
-  for ac_arg5 in 'struct timeval *' 'const struct timeval *'; do
-   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-$ac_includes_default
-#ifdef HAVE_SYS_SELECT_H
-# include <sys/select.h>
-#endif
-#ifdef HAVE_SYS_SOCKET_H
-# include <sys/socket.h>
-#endif
 
 int
 main ()
 {
-extern int select ($ac_arg1,
-					    $ac_arg234, $ac_arg234, $ac_arg234,
-					    $ac_arg5);
+
+#ifndef __cplusplus
+  /* Ultrix mips cc rejects this sort of thing.  */
+  typedef int charset[2];
+  const charset cs = { 0, 0 };
+  /* SunOS 4.1.1 cc rejects this.  */
+  char const *const *pcpcc;
+  char **ppc;
+  /* NEC SVR4.0.2 mips cc rejects this.  */
+  struct point {int x, y;};
+  static struct point const zero = {0,0};
+  /* AIX XL C 1.02.0.0 rejects this.
+     It does not let you subtract one const X* pointer from another in
+     an arm of an if-expression whose if-part is not a constant
+     expression */
+  const char *g = "string";
+  pcpcc = &g + (g ? g-g : 0);
+  /* HPUX 7.0 cc rejects these. */
+  ++pcpcc;
+  ppc = (char**) pcpcc;
+  pcpcc = (char const *const *) ppc;
+  { /* SCO 3.2v4 cc rejects this sort of thing.  */
+    char tx;
+    char *t = &tx;
+    char const *s = 0 ? (char *) 0 : (char const *) 0;
+
+    *t++ = 0;
+    if (s) return 0;
+  }
+  { /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
+    int x[] = {25, 17};
+    const int *foo = &x[0];
+    ++foo;
+  }
+  { /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
+    typedef const int *iptr;
+    iptr p = 0;
+    ++p;
+  }
+  { /* AIX XL C 1.02.0.0 rejects this sort of thing, saying
+       "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
+    struct s { int j; const int *ap[3]; } bx;
+    struct s *b = &bx; b->j = 5;
+  }
+  { /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
+    const int foo = 10;
+    if (!foo) return 0;
+  }
+  return !cs[0] && !zero.x;
+#endif
+
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_func_select_args="$ac_arg1,$ac_arg234,$ac_arg5"; break 3
+  ac_cv_c_const=yes
+else
+  ac_cv_c_const=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-  done
- done
-done
-# Provide a safe default value.
-: "${ac_cv_func_select_args=int,int *,struct timeval *}"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_const" >&5
+$as_echo "$ac_cv_c_const" >&6; }
+if test $ac_cv_c_const = no; then
+
+$as_echo "#define const /**/" >>confdefs.h
 
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_select_args" >&5
-$as_echo "$ac_cv_func_select_args" >&6; }
-ac_save_IFS=$IFS; IFS=','
-set dummy `echo "$ac_cv_func_select_args" | sed 's/\*/\*/g'`
-IFS=$ac_save_IFS
-shift
+
+ac_fn_c_check_type "$LINENO" "pid_t" "ac_cv_type_pid_t" "$ac_includes_default"
+if test "x$ac_cv_type_pid_t" = xyes; then :
+
+else
 
 cat >>confdefs.h <<_ACEOF
-#define SELECT_TYPE_ARG1 $1
+#define pid_t int
 _ACEOF
 
+fi
+
+ac_fn_c_check_type "$LINENO" "size_t" "ac_cv_type_size_t" "$ac_includes_default"
+if test "x$ac_cv_type_size_t" = xyes; then :
+
+else
 
 cat >>confdefs.h <<_ACEOF
-#define SELECT_TYPE_ARG234 ($2)
+#define size_t unsigned int
+_ACEOF
+
+fi
+
+ac_fn_c_check_type "$LINENO" "ssize_t" "ac_cv_type_ssize_t" "$ac_includes_default"
+if test "x$ac_cv_type_ssize_t" = xyes; then :
+
+else
+
+cat >>confdefs.h <<_ACEOF
+#define ssize_t int
 _ACEOF
 
+fi
+
+ac_fn_c_find_uintX_t "$LINENO" "16" "ac_cv_c_uint16_t"
+case $ac_cv_c_uint16_t in #(
+  no|yes) ;; #(
+  *)
+
 
 cat >>confdefs.h <<_ACEOF
-#define SELECT_TYPE_ARG5 ($3)
+#define uint16_t $ac_cv_c_uint16_t
 _ACEOF
+;;
+  esac
 
-rm -f conftest*
+ac_fn_c_find_uintX_t "$LINENO" "8" "ac_cv_c_uint8_t"
+case $ac_cv_c_uint8_t in #(
+  no|yes) ;; #(
+  *)
+
+$as_echo "#define _UINT8_T 1" >>confdefs.h
+
+
+cat >>confdefs.h <<_ACEOF
+#define uint8_t $ac_cv_c_uint8_t
+_ACEOF
+;;
+  esac
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking return type of signal handlers" >&5
-$as_echo_n "checking return type of signal handlers... " >&6; }
-if ${ac_cv_type_signal+:} false; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether time.h and sys/time.h may both be included" >&5
+$as_echo_n "checking whether time.h and sys/time.h may both be included... " >&6; }
+if ${ac_cv_header_time+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <sys/types.h>
-#include <signal.h>
+#include <sys/time.h>
+#include <time.h>
 
 int
 main ()
 {
-return *(signal (0, 0)) (0) == 1;
+if ((struct tm *) 0)
+return 0;
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_type_signal=int
+  ac_cv_header_time=yes
 else
-  ac_cv_type_signal=void
+  ac_cv_header_time=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_signal" >&5
-$as_echo "$ac_cv_type_signal" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_time" >&5
+$as_echo "$ac_cv_header_time" >&6; }
+if test $ac_cv_header_time = yes; then
 
-cat >>confdefs.h <<_ACEOF
-#define RETSIGTYPE $ac_cv_type_signal
+$as_echo "#define TIME_WITH_SYS_TIME 1" >>confdefs.h
+
+fi
+
+
+for ac_header in vfork.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "vfork.h" "ac_cv_header_vfork_h" "$ac_includes_default"
+if test "x$ac_cv_header_vfork_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_VFORK_H 1
 _ACEOF
 
+fi
+
+done
 
-for ac_func in memset select setresuid setreuid strerror getpwnam_r setrlimit
+for ac_func in fork vfork
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -15013,552 +15143,422 @@ _ACEOF
 fi
 done
 
-
-if test "$ac_cv_func_select" != "yes"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for select in ws2_32" >&5
-$as_echo_n "checking for select in ws2_32... " >&6; }
+if test "x$ac_cv_func_fork" = xyes; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working fork" >&5
+$as_echo_n "checking for working fork... " >&6; }
+if ${ac_cv_func_fork_works+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "$cross_compiling" = yes; then :
+  ac_cv_func_fork_works=cross
+else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
-#ifdef HAVE_WINSOCK2_H
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-#include <winsock2.h>
-#endif
-
+$ac_includes_default
 int
 main ()
 {
 
-      select(0,(fd_set *)NULL,(fd_set *)NULL,(fd_set *)NULL,(struct timeval *)NULL);
+	  /* By Ruediger Kuhlmann. */
+	  return fork () < 0;
 
   ;
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-
-      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-      HAVE_SELECT="1"
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_SELECT 1
-_ACEOF
-
-      HAVE_SYS_SELECT_H="1"
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_SYS_SELECT_H 1
-_ACEOF
-
-
+if ac_fn_c_try_run "$LINENO"; then :
+  ac_cv_func_fork_works=yes
 else
+  ac_cv_func_fork_works=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
 
-      as_fn_error $? "no" "$LINENO" 5
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_fork_works" >&5
+$as_echo "$ac_cv_func_fork_works" >&6; }
 
+else
+  ac_cv_func_fork_works=$ac_cv_func_fork
 fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
+if test "x$ac_cv_func_fork_works" = xcross; then
+  case $host in
+    *-*-amigaos* | *-*-msdosdjgpp*)
+      # Override, as these systems have only a dummy fork() stub
+      ac_cv_func_fork_works=no
+      ;;
+    *)
+      ac_cv_func_fork_works=yes
+      ;;
+  esac
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: result $ac_cv_func_fork_works guessed because of cross compilation" >&5
+$as_echo "$as_me: WARNING: result $ac_cv_func_fork_works guessed because of cross compilation" >&2;}
 fi
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for connect in -lsocket" >&5
-$as_echo_n "checking for connect in -lsocket... " >&6; }
-if ${ac_cv_lib_socket_connect+:} false; then :
+ac_cv_func_vfork_works=$ac_cv_func_vfork
+if test "x$ac_cv_func_vfork" = xyes; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for working vfork" >&5
+$as_echo_n "checking for working vfork... " >&6; }
+if ${ac_cv_func_vfork_works+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lsocket  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+  if test "$cross_compiling" = yes; then :
+  ac_cv_func_vfork_works=cross
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
+/* Thanks to Paul Eggert for this test.  */
+$ac_includes_default
+#include <sys/wait.h>
+#ifdef HAVE_VFORK_H
+# include <vfork.h>
+#endif
+/* On some sparc systems, changes by the child to local and incoming
+   argument registers are propagated back to the parent.  The compiler
+   is told about this with #include <vfork.h>, but some compilers
+   (e.g. gcc -O) don't grok <vfork.h>.  Test for this by using a
+   static variable whose address is put into a register that is
+   clobbered by the vfork.  */
+static void
 #ifdef __cplusplus
-extern "C"
+sparc_address_test (int arg)
+# else
+sparc_address_test (arg) int arg;
 #endif
-char connect ();
-int
-main ()
 {
-return connect ();
-  ;
-  return 0;
+  static pid_t child;
+  if (!child) {
+    child = vfork ();
+    if (child < 0) {
+      perror ("vfork");
+      _exit(2);
+    }
+    if (!child) {
+      arg = getpid();
+      write(-1, "", 0);
+      _exit (arg);
+    }
+  }
 }
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_socket_connect=yes
-else
-  ac_cv_lib_socket_connect=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_connect" >&5
-$as_echo "$ac_cv_lib_socket_connect" >&6; }
-if test "x$ac_cv_lib_socket_connect" = xyes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBSOCKET 1
-_ACEOF
-
-  LIBS="-lsocket $LIBS"
-
-fi
-
-
-for ac_func in malloc memset socket
-do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
-
 
+int
+main ()
+{
+  pid_t parent = getpid ();
+  pid_t child;
 
+  sparc_address_test (0);
 
-ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
+  child = vfork ();
 
-ax_pthread_ok=no
+  if (child == 0) {
+    /* Here is another test for sparc vfork register problems.  This
+       test uses lots of local variables, at least as many local
+       variables as main has allocated so far including compiler
+       temporaries.  4 locals are enough for gcc 1.40.3 on a Solaris
+       4.1.3 sparc, but we use 8 to be safe.  A buggy compiler should
+       reuse the register of parent for one of the local variables,
+       since it will think that parent can't possibly be used any more
+       in this routine.  Assigning to the local variable will thus
+       munge parent in the parent process.  */
+    pid_t
+      p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(),
+      p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid();
+    /* Convince the compiler that p..p7 are live; otherwise, it might
+       use the same hardware register for all 8 local variables.  */
+    if (p != p1 || p != p2 || p != p3 || p != p4
+	|| p != p5 || p != p6 || p != p7)
+      _exit(1);
 
-# We used to check for pthread.h first, but this fails if pthread.h
-# requires special compiler flags (e.g. on True64 or Sequent).
-# It gets checked for in the link test anyway.
+    /* On some systems (e.g. IRIX 3.3), vfork doesn't separate parent
+       from child file descriptors.  If the child closes a descriptor
+       before it execs or exits, this munges the parent's descriptor
+       as well.  Test for this by closing stdout in the child.  */
+    _exit(close(fileno(stdout)) != 0);
+  } else {
+    int status;
+    struct stat st;
 
-# First of all, check if the user has set any of the PTHREAD_LIBS,
-# etcetera environment variables, and if threads linking works using
-# them:
-if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS" >&5
-$as_echo_n "checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS... " >&6; }
-        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
+    while (wait(&status) != child)
+      ;
+    return (
+	 /* Was there some problem with vforking?  */
+	 child < 0
 
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char pthread_join ();
-int
-main ()
-{
-return pthread_join ();
-  ;
-  return 0;
+	 /* Did the child fail?  (This shouldn't happen.)  */
+	 || status
+
+	 /* Did the vfork/compiler bug occur?  */
+	 || parent != getpid()
+
+	 /* Did the file descriptor bug occur?  */
+	 || fstat(fileno(stdout), &st) != 0
+	 );
+  }
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ax_pthread_ok=yes
+if ac_fn_c_try_run "$LINENO"; then :
+  ac_cv_func_vfork_works=yes
+else
+  ac_cv_func_vfork_works=no
 fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_ok" >&5
-$as_echo "$ax_pthread_ok" >&6; }
-        if test x"$ax_pthread_ok" = xno; then
-                PTHREAD_LIBS=""
-                PTHREAD_CFLAGS=""
-        fi
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
 fi
 
-# We must check for the threads library under a number of different
-# names; the ordering is very important because some systems
-# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
-# libraries is broken (non-POSIX).
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_vfork_works" >&5
+$as_echo "$ac_cv_func_vfork_works" >&6; }
 
-# Create a list of thread flags to try.  Items starting with a "-" are
-# C compiler flags, and other items are library names, except for "none"
-# which indicates that we try without any flags at all, and "pthread-config"
-# which is a program returning the flags for the Pth emulation library.
+fi;
+if test "x$ac_cv_func_fork_works" = xcross; then
+  ac_cv_func_vfork_works=$ac_cv_func_vfork
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: result $ac_cv_func_vfork_works guessed because of cross compilation" >&5
+$as_echo "$as_me: WARNING: result $ac_cv_func_vfork_works guessed because of cross compilation" >&2;}
+fi
 
-ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+if test "x$ac_cv_func_vfork_works" = xyes; then
 
-# The ordering *is* (sometimes) important.  Some notes on the
-# individual items follow:
+$as_echo "#define HAVE_WORKING_VFORK 1" >>confdefs.h
 
-# pthreads: AIX (must check this before -lpthread)
-# none: in case threads are in libc; should be tried before -Kthread and
-#       other compiler flags to prevent continual compiler warnings
-# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
-# -pthreads: Solaris/gcc
-# -mthreads: Mingw32/gcc, Lynx/gcc
-# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-#      doesn't hurt to check since this sometimes defines pthreads too;
-#      also defines -D_REENTRANT)
-#      ... -mt is also the pthreads flag for HP/aCC
-# pthread: Linux, etcetera
-# --thread-safe: KAI C++
-# pthread-config: use pthread-config program (for GNU Pth library)
+else
 
-case ${host_os} in
-        solaris*)
+$as_echo "#define vfork fork" >>confdefs.h
 
-        # On Solaris (at least, for some versions), libc contains stubbed
-        # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
-        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
-        # a function called by this macro, so we could check for that, but
-        # who knows whether they'll stub that too in a future libc.)  So,
-        # we'll just look for -pthreads and -lpthread first:
+fi
+if test "x$ac_cv_func_fork_works" = xyes; then
 
-        ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
-        ;;
-esac
+$as_echo "#define HAVE_WORKING_FORK 1" >>confdefs.h
 
-# Clang doesn't consider unrecognized options an error unless we specify
-# -Werror. We throw in some extra Clang-specific options to ensure that
-# this doesn't happen for GCC, which also accepts -Werror.
+fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler needs -Werror to reject unknown flags" >&5
-$as_echo_n "checking if compiler needs -Werror to reject unknown flags... " >&6; }
-save_CFLAGS="$CFLAGS"
-ax_pthread_extra_flags="-Werror"
-CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+for ac_header in sys/select.h sys/socket.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking types of arguments for select" >&5
+$as_echo_n "checking types of arguments for select... " >&6; }
+if ${ac_cv_func_select_args+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  for ac_arg234 in 'fd_set *' 'int *' 'void *'; do
+ for ac_arg1 in 'int' 'size_t' 'unsigned long int' 'unsigned int'; do
+  for ac_arg5 in 'struct timeval *' 'const struct timeval *'; do
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-int foo(void);
+$ac_includes_default
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+
 int
 main ()
 {
-foo()
+extern int select ($ac_arg1,
+					    $ac_arg234, $ac_arg234, $ac_arg234,
+					    $ac_arg5);
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-else
-  ax_pthread_extra_flags=
-                   { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
+  ac_cv_func_select_args="$ac_arg1,$ac_arg234,$ac_arg5"; break 3
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-CFLAGS="$save_CFLAGS"
-
-if test x"$ax_pthread_ok" = xno; then
-for flag in $ax_pthread_flags; do
-
-        case $flag in
-                none)
-                { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work without any flags" >&5
-$as_echo_n "checking whether pthreads work without any flags... " >&6; }
-                ;;
-
-                -*)
-                { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether pthreads work with $flag" >&5
-$as_echo_n "checking whether pthreads work with $flag... " >&6; }
-                PTHREAD_CFLAGS="$flag"
-                ;;
-
-                pthread-config)
-                # Extract the first word of "pthread-config", so it can be a program name with args.
-set dummy pthread-config; ac_word=$2
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
-$as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_ax_pthread_config+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test -n "$ax_pthread_config"; then
-  ac_cv_prog_ax_pthread_config="$ax_pthread_config" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_ax_pthread_config="yes"
-    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
   done
-IFS=$as_save_IFS
+ done
+done
+# Provide a safe default value.
+: "${ac_cv_func_select_args=int,int *,struct timeval *}"
 
-  test -z "$ac_cv_prog_ax_pthread_config" && ac_cv_prog_ax_pthread_config="no"
-fi
-fi
-ax_pthread_config=$ac_cv_prog_ax_pthread_config
-if test -n "$ax_pthread_config"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_config" >&5
-$as_echo "$ax_pthread_config" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_func_select_args" >&5
+$as_echo "$ac_cv_func_select_args" >&6; }
+ac_save_IFS=$IFS; IFS=','
+set dummy `echo "$ac_cv_func_select_args" | sed 's/\*/\*/g'`
+IFS=$ac_save_IFS
+shift
 
+cat >>confdefs.h <<_ACEOF
+#define SELECT_TYPE_ARG1 $1
+_ACEOF
 
-                if test x"$ax_pthread_config" = xno; then continue; fi
-                PTHREAD_CFLAGS="`pthread-config --cflags`"
-                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
-                ;;
 
-                *)
-                { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the pthreads library -l$flag" >&5
-$as_echo_n "checking for the pthreads library -l$flag... " >&6; }
-                PTHREAD_LIBS="-l$flag"
-                ;;
-        esac
+cat >>confdefs.h <<_ACEOF
+#define SELECT_TYPE_ARG234 ($2)
+_ACEOF
 
-        save_LIBS="$LIBS"
-        save_CFLAGS="$CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags"
 
-        # Check for various functions.  We must include pthread.h,
-        # since some functions may be macros.  (On the Sequent, we
-        # need a special flag -Kthread to make this header compile.)
-        # We check for pthread_join because it is in -lpthread on IRIX
-        # while pthread_create is in libc.  We check for pthread_attr_init
-        # due to DEC craziness with -lpthreads.  We check for
-        # pthread_cleanup_push because it is one of the few pthread
-        # functions on Solaris that doesn't have a non-functional libc stub.
-        # We try pthread_create on general principles.
-        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+cat >>confdefs.h <<_ACEOF
+#define SELECT_TYPE_ARG5 ($3)
+_ACEOF
+
+rm -f conftest*
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking return type of signal handlers" >&5
+$as_echo_n "checking return type of signal handlers... " >&6; }
+if ${ac_cv_type_signal+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <pthread.h>
-                        static void routine(void *a) { a = 0; }
-                        static void *start_routine(void *a) { return a; }
+#include <sys/types.h>
+#include <signal.h>
+
 int
 main ()
 {
-pthread_t th; pthread_attr_t attr;
-                        pthread_create(&th, 0, start_routine, 0);
-                        pthread_join(th, 0);
-                        pthread_attr_init(&attr);
-                        pthread_cleanup_push(routine, 0);
-                        pthread_cleanup_pop(0) /* ; */
+return *(signal (0, 0)) (0) == 1;
   ;
   return 0;
 }
 _ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ax_pthread_ok=yes
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_type_signal=int
+else
+  ac_cv_type_signal=void
 fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_signal" >&5
+$as_echo "$ac_cv_type_signal" >&6; }
 
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
+cat >>confdefs.h <<_ACEOF
+#define RETSIGTYPE $ac_cv_type_signal
+_ACEOF
 
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_pthread_ok" >&5
-$as_echo "$ax_pthread_ok" >&6; }
-        if test "x$ax_pthread_ok" = xyes; then
-                break;
-        fi
 
-        PTHREAD_LIBS=""
-        PTHREAD_CFLAGS=""
-done
+for ac_func in memset select setresuid setreuid strerror getpwnam_r setrlimit
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
 fi
+done
 
-# Various other checks:
-if test "x$ax_pthread_ok" = xyes; then
-        save_LIBS="$LIBS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        save_CFLAGS="$CFLAGS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 
-        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for joinable pthread attribute" >&5
-$as_echo_n "checking for joinable pthread attribute... " >&6; }
-        attr_name=unknown
-        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+if test "$ac_cv_func_select" != "yes"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for select in ws2_32" >&5
+$as_echo_n "checking for select in ws2_32... " >&6; }
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <pthread.h>
+
+#ifdef HAVE_WINSOCK2_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <winsock2.h>
+#endif
+
 int
 main ()
 {
-int attr = $attr; return attr /* ; */
+
+      select(0,(fd_set *)NULL,(fd_set *)NULL,(fd_set *)NULL,(struct timeval *)NULL);
+
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  attr_name=$attr; break
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-        done
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $attr_name" >&5
-$as_echo "$attr_name" >&6; }
-        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
+
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+      HAVE_SELECT="1"
 
 cat >>confdefs.h <<_ACEOF
-#define PTHREAD_CREATE_JOINABLE $attr_name
+#define HAVE_SELECT 1
 _ACEOF
 
-        fi
+      HAVE_SYS_SELECT_H="1"
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_SYS_SELECT_H 1
+_ACEOF
 
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking if more special flags are required for pthreads" >&5
-$as_echo_n "checking if more special flags are required for pthreads... " >&6; }
-        flag=no
-        case ${host_os} in
-            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
-            osf* | hpux*) flag="-D_REENTRANT";;
-            solaris*)
-            if test "$GCC" = "yes"; then
-                flag="-D_REENTRANT"
-            else
-                # TODO: What about Clang on Solaris?
-                flag="-mt -D_REENTRANT"
-            fi
-            ;;
-        esac
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: $flag" >&5
-$as_echo "$flag" >&6; }
-        if test "x$flag" != xno; then
-            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
-        fi
 
-        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PTHREAD_PRIO_INHERIT" >&5
-$as_echo_n "checking for PTHREAD_PRIO_INHERIT... " >&6; }
-if ${ax_cv_PTHREAD_PRIO_INHERIT+:} false; then :
-  $as_echo_n "(cached) " >&6
 else
 
-                cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+      as_fn_error $? "no" "$LINENO" 5
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for connect in -lsocket" >&5
+$as_echo_n "checking for connect in -lsocket... " >&6; }
+if ${ac_cv_lib_socket_connect+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lsocket  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <pthread.h>
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char connect ();
 int
 main ()
 {
-int i = PTHREAD_PRIO_INHERIT;
+return connect ();
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  ax_cv_PTHREAD_PRIO_INHERIT=yes
+  ac_cv_lib_socket_connect=yes
 else
-  ax_cv_PTHREAD_PRIO_INHERIT=no
+  ac_cv_lib_socket_connect=no
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
-
+LIBS=$ac_check_lib_save_LIBS
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_PTHREAD_PRIO_INHERIT" >&5
-$as_echo "$ax_cv_PTHREAD_PRIO_INHERIT" >&6; }
-        if test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_connect" >&5
+$as_echo "$ac_cv_lib_socket_connect" >&6; }
+if test "x$ac_cv_lib_socket_connect" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSOCKET 1
+_ACEOF
 
-$as_echo "#define HAVE_PTHREAD_PRIO_INHERIT 1" >>confdefs.h
+  LIBS="-lsocket $LIBS"
 
 fi
 
-        LIBS="$save_LIBS"
-        CFLAGS="$save_CFLAGS"
 
-        # More AIX lossage: compile with *_r variant
-        if test "x$GCC" != xyes; then
-            case $host_os in
-                aix*)
-                case "x/$CC" in #(
-  x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6) :
-    #handle absolute path differently from PATH based program lookup
-                   case "x$CC" in #(
-  x/*) :
-    if as_fn_executable_p ${CC}_r; then :
-  PTHREAD_CC="${CC}_r"
-fi ;; #(
-  *) :
-    for ac_prog in ${CC}_r
-do
-  # Extract the first word of "$ac_prog", so it can be a program name with args.
-set dummy $ac_prog; ac_word=$2
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
-$as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_PTHREAD_CC+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test -n "$PTHREAD_CC"; then
-  ac_cv_prog_PTHREAD_CC="$PTHREAD_CC" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_PTHREAD_CC="$ac_prog"
-    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-  done
-IFS=$as_save_IFS
+for ac_func in malloc memset socket
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
 
 fi
-fi
-PTHREAD_CC=$ac_cv_prog_PTHREAD_CC
-if test -n "$PTHREAD_CC"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PTHREAD_CC" >&5
-$as_echo "$PTHREAD_CC" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
-  test -n "$PTHREAD_CC" && break
 done
-test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
- ;;
-esac ;; #(
-  *) :
-     ;;
-esac
-                ;;
-            esac
-        fi
-fi
-
-test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
-
-
-
-
-
-# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test x"$ax_pthread_ok" = xyes; then
-        LIBS="$PTHREAD_LIBS $LIBS"
-            CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-            CC="$PTHREAD_CC"
-        :
-else
-        ax_pthread_ok=no
-        as_fn_error $? "Can not find pthreads.  This is required." "$LINENO" 5
-fi
-ac_ext=c
-ac_cpp='$CPP $CPPFLAGS'
-ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
-ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
-ac_compiler_gnu=$ac_cv_c_compiler_gnu
-
 
 
 
@@ -16122,7 +16122,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by shadowsocks-libev $as_me 2.4.4, which was
+This file was extended by shadowsocks-libev $as_me 2.4.5, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -16188,7 +16188,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-shadowsocks-libev config.status 2.4.4
+shadowsocks-libev config.status 2.4.5
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 67e74505..c1017ba1 100755
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ dnl                                               -*- Autoconf -*-
 dnl Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.67])
-AC_INIT([shadowsocks-libev], [2.4.4], [max.c.lv@gmail.com])
+AC_INIT([shadowsocks-libev], [2.4.5], [max.c.lv@gmail.com])
 AC_CONFIG_SRCDIR([src/encrypt.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_AUX_DIR(auto)
diff --git a/debian/changelog b/debian/changelog
index ab686542..0338ed50 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+shadowsocks-libev (2.4.5-1) unstable; urgency=low
+
+  * Fix build issues on OpenWRT.
+  * Reduce the latency for redir mode.
+
+ -- Max Lv <max.c.lv@gmail.com>  Mon, 01 Feb 2016 13:22:50 +0800
+
 shadowsocks-libev (2.4.4-1) unstable; urgency=low
 
   * Fix a potential memory leak.
diff --git a/openwrt/Makefile b/openwrt/Makefile
index 923ad277..c7bd932c 100644
--- a/openwrt/Makefile
+++ b/openwrt/Makefile
@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shadowsocks-libev
-PKG_VERSION:=2.4.4
+PKG_VERSION:=2.4.5
 PKG_RELEASE=$(PKG_SOURCE_VERSION)
 
 PKG_SOURCE_URL:=https://github.com/shadowsocks/shadowsocks-libev/archive