GNU Gettext: Fix Cygwin build.

svn path=/nixpkgs/trunk/; revision=34270

pkgs/development/libraries/gettext/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchurl, libiconv }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (rec {
   name = "gettext-0.18.1.1";
   
   src = fetchurl {
@@ -8,7 +8,14 @@ stdenv.mkDerivation rec {
     sha256 = "1sa3ch12qxa4h3ya6hkz119yclcccmincl9j20dhrdx5mykp3b4k";
   };
 
-  configureFlags = "--disable-csharp";
+  configureFlags = [ "--disable-csharp" ]
+     ++ (stdenv.lib.optionals stdenv.isCygwin
+          [ # We have a static libiconv, so we can only build the static lib.
+            "--disable-shared" "--enable-static"
+
+            # Share the cache among the various `configure' runs.
+            "--config-cache"
+          ]);
 
   # On cross building, gettext supposes that the wchar.h from libc
   # does not fulfill gettext needs, so it tries to work with its
@@ -60,3 +67,16 @@ stdenv.mkDerivation rec {
     platforms = stdenv.lib.platforms.all;
   };
 }
+
+//
+
+stdenv.lib.optionalAttrs stdenv.isCygwin {
+  patchPhase =
+   # Make sure `error.c' gets compiled and is part of `libgettextlib.la'.
+   # This fixes:
+   # gettext-0.18.1.1/gettext-tools/src/msgcmp.c:371: undefined reference to `_error_message_count'
+
+   '' sed -i gettext-tools/gnulib-lib/Makefile.in \
+          -e 's/am_libgettextlib_la_OBJECTS =/am_libgettextlib_la_OBJECTS = error.lo/g'
+   '';
+})