enable to be compiled in cygwin

configure.ac

@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.68])
-AC_INIT([libev-hello], [0.1], [clowwindy42@gmail.com])
+AC_INIT([shadowsocks], [0.9], [clowwindy42@gmail.com|max.c.lv@gmail.com])
 AC_CONFIG_SRCDIR([encrypt.c])
 AC_CONFIG_HEADERS([config.h])
 

local.c

@@ -29,6 +29,10 @@
 #define MSG_NOSIGNAL MSG_HAVEMORE
 #endif
 
+#ifndef EAGAIN
+#define EAGAIN EWOULDBLOCK
+#endif
+
 #define min(a,b) (((a)<(b))?(a):(b))
 
 static char *_server;