* libXft: pass through the freetype and fontconfig inputs (Qt needs

them).
* Add Qt to the cache.  Contrary to what the previous commit message
  said, there is nothing wrong with the Qt build.  It was just a
  problem on my local machine (you shouldn't run `./configure -help'
  in a temporary build directory; it overwrites some files of the
  build in progress).

svn path=/nixpkgs/trunk/; revision=2067

pkgs/development/libraries/xlibs/libXft/default.nix

@@ -3,7 +3,7 @@
 # !!! assert freetype `elem` fontconfig.buildInputs or some such
 # assert freetype == fontconfig.freetype;
 
-stdenv.mkDerivation {
+(stdenv.mkDerivation {
   name = "libXft-2.1.6";
   src = fetchurl {
     url = http://freedesktop.org/~xlibs/release/libXft-2.1.6.tar.bz2;
@@ -11,4 +11,4 @@ stdenv.mkDerivation {
   };
   buildInputs = [pkgconfig];
   propagatedBuildInputs = [libX11 libXrender freetype fontconfig];
-}
+}) // {inherit freetype fontconfig;}