cygwin: libffi

pkgs/development/libraries/libffi/3.2.1-cygwin.patch

@@ -0,0 +1,10 @@
+--- libffi-3.2.1/src/closures.c	2014-11-08 13:47:24.000000000 +0100
++++ libffi-3.2.1/src/closures.c	2015-05-19 10:15:50.059325900 +0200
+@@ -212,6 +212,7 @@
+ #include <sys/mman.h>
+ 
+ /* Cygwin is Linux-like, but not quite that Linux-like.  */
++#define is_emutramp_enabled() 0
+ #define is_selinux_enabled() 0
+ 
+ #endif /* !defined(X86_WIN32) && !defined(X86_WIN64) */

pkgs/development/libraries/libffi/default.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
     sha256 = "0dya49bnhianl0r65m65xndz6ls2jn1xngyn72gd28ls3n7bnvnh";
   };
 
+  patches = if stdenv.isCygwin then [ ./3.2.1-cygwin.patch ] else null;
+
   buildInputs = stdenv.lib.optional doCheck dejagnu;
 
   configureFlags = [