Fix #1168

Makefile.am

@@ -1,4 +1,8 @@
+if USE_SYSTEM_SHARED_LIB
+SUBDIRS = src
+else
 SUBDIRS = libcork libipset src
+endif
 
 if ENABLE_DOCUMENTATION
 SUBDIRS += doc

configure.ac

@@ -282,14 +282,17 @@ AC_CHECK_LIB([udns], [dns_dnlen], [LIBS="-ludns $LIBS"], [AC_MSG_ERROR([Couldn't
 AC_CHECK_HEADERS([ev.h], [], [AC_MSG_ERROR([Couldn't find libev. Try installing libev-dev@<:@el@:>@.])])
 AC_CHECK_LIB([ev], [ev_loop_destroy], [LIBS="-lev $LIBS"], [AC_MSG_ERROR([Couldn't find libev. Try installing libev-dev@<:@el@:>@.])])
 
-AM_COND_IF([ENABLE_DOCUMENTATION],
-  [AC_CONFIG_FILES([doc/Makefile])
-])
-
 AC_CONFIG_FILES([shadowsocks-libev.pc
                  Makefile
-                 libcork/Makefile
-                 libipset/Makefile
                  src/Makefile])
 
+AM_COND_IF([USE_SYSTEM_SHARED_LIB],
+		   [],
+		   [AC_CONFIG_FILES([libcork/Makefile
+							 libipset/Makefile])])
+
+AM_COND_IF([ENABLE_DOCUMENTATION],
+  [AC_CONFIG_FILES([doc/Makefile])
+])
+
 AC_OUTPUT

src/Makefile.am

@@ -2,13 +2,19 @@ VERSION_INFO = 2:0:0
 
 AM_CFLAGS = -g -O2 -Wall -Werror -Wno-deprecated-declarations -fno-strict-aliasing -std=gnu99 -D_GNU_SOURCE
 AM_CFLAGS += $(PTHREAD_CFLAGS)
+if !USE_SYSTEM_SHARED_LIB
 AM_CFLAGS += -I$(top_srcdir)/libipset/include
 AM_CFLAGS += -I$(top_srcdir)/libcork/include
+endif
 AM_CFLAGS += $(LIBPCRE_CFLAGS)
 
-SS_COMMON_LIBS = $(top_builddir)/libipset/libipset.la \
-                 $(top_builddir)/libcork/libcork.la \
-                 $(INET_NTOP_LIB) $(LIBPCRE_LIBS)
+SS_COMMON_LIBS = $(INET_NTOP_LIB) $(LIBPCRE_LIBS)
+if !USE_SYSTEM_SHARED_LIB
+SS_COMMON_LIBS += $(top_builddir)/libipset/libipset.la \
+                  $(top_builddir)/libcork/libcork.la
+else
+SS_COMMON_LIBS += -lcork -lcorkipset
+endif
 SS_COMMON_LIBS += -lev -lsodium -lm
 
 bin_PROGRAMS = ss-local ss-tunnel ss-server ss-manager