Cairo: Add dependency on Gettext on non-GNU systems; build it.

svn path=/nixpkgs/trunk/; revision=29495

pkgs/development/libraries/cairo/default.nix

@@ -5,6 +5,7 @@
 , gobjectSupport ? true, glib
 , stdenv, fetchurl, pkgconfig, x11, fontconfig, freetype, xlibs
 , zlib, libpng, pixman, libxcb ? null, xcbutil ? null
+, gettext
 }:
 
 assert postscriptSupport -> zlib != null;
@@ -22,7 +23,10 @@ stdenv.mkDerivation rec {
   buildInputs =
     [ pkgconfig x11 fontconfig pixman xlibs.libXrender ]
     ++ stdenv.lib.optionals xcbSupport [ libxcb xcbutil ]
-    ++ stdenv.lib.optional gobjectSupport glib;
+    ++ stdenv.lib.optional gobjectSupport glib
+
+    # On non-GNU systems we need GNU Gettext for libintl.
+    ++ stdenv.lib.optional (!stdenv.isLinux) gettext;
 
   propagatedBuildInputs =
     [ freetype ] ++
@@ -62,5 +66,7 @@ stdenv.mkDerivation rec {
     homepage = http://cairographics.org/;
 
     licenses = [ "LGPLv2+" "MPLv1" ];
+
+    platforms = stdenv.lib.platforms.all;
   };
 }