diff -Naur gcc-4.9.2-orig/libjava/classpath/configure gcc-4.9.2/libjava/classpath/configure
--- gcc-4.9.2-orig/libjava/classpath/configure	2013-09-20 12:47:52.000000000 +0300
+++ gcc-4.9.2/libjava/classpath/configure	2014-11-03 23:57:13.709800000 +0300
@@ -3180,7 +3180,7 @@
 	cp_module=""
 	;;
 	*)
-	cp_module="-module"
+	cp_module="-module -avoid-version"
 	;;
 esac
 
diff -Naur gcc-4.9.2-orig/libjava/classpath/configure.ac gcc-4.9.2/libjava/classpath/configure.ac
--- gcc-4.9.2-orig/libjava/classpath/configure.ac	2013-05-23 00:25:59.000000000 +0300
+++ gcc-4.9.2/libjava/classpath/configure.ac	2014-11-03 23:57:13.725400000 +0300
@@ -64,7 +64,7 @@
 	cp_module=""
 	;;
 	*)
-	cp_module="-module"
+	cp_module="-module -avoid-version"
 	;;
 esac
 
diff -Naur gcc-4.9.2-orig/libjava/include/posix.h gcc-4.9.2/libjava/include/posix.h
--- gcc-4.9.2-orig/libjava/include/posix.h	2012-03-12 18:35:56.000000000 +0300
+++ gcc-4.9.2/libjava/include/posix.h	2014-11-03 23:57:13.725400000 +0300
@@ -42,11 +42,17 @@
 #include <java/util/Properties.h>
 
 // Prefix and suffix for shared libraries.
+#ifdef __CYGWIN__
+#define _Jv_platform_solib_prefix "cyg"
+#else
 #define _Jv_platform_solib_prefix "lib"
+#endif
 #if defined(__APPLE__) && defined(__MACH__)
 #define _Jv_platform_solib_suffix ".dylib"
 #elif defined(HPUX) && defined(HP_PA)
 #define _Jv_platform_solib_suffix ".sl"
+#elif defined(__CYGWIN__)
+#define _Jv_platform_solib_suffix ".dll"
 #else
 #define _Jv_platform_solib_suffix ".so"
 #endif
diff -Naur gcc-4.9.2-orig/libjava/java/net/natVMURLConnection.cc gcc-4.9.2/libjava/java/net/natVMURLConnection.cc
--- gcc-4.9.2-orig/libjava/java/net/natVMURLConnection.cc	2009-12-02 01:05:25.000000000 +0300
+++ gcc-4.9.2/libjava/java/net/natVMURLConnection.cc	2014-11-03 23:57:13.725400000 +0300
@@ -32,7 +32,11 @@
 java::net::VMURLConnection::init ()
 {
 #if defined (HAVE_MAGIC_T) && defined (HAVE_MAGIC_H) && defined (USE_LTDL)
+#ifdef __CYGWIN__
+  lt_dlhandle handle = lt_dlopenext ("cygmagic-1.dll");
+#else
   lt_dlhandle handle = lt_dlopenext ("libmagic.so");
+#endif
   if (!handle)
     return;