anchor.diff:  
     src = fetchurl {
       url = "mirror://savannah/freetype/${name}.tar.bz2";
  -    sha256 = "12jcdz1in20yaa55izxalg3hm1pf7nydfrzps5bzb4zgihybmzz6";
  +    sha256 = "0kg8w6qyiizlyzh4a8lpzslipcbv96hcg3rqqpnxba8ffbm8g3fv";
     };
   
     propagatedBuildInputs = [ zlib bzip2 libpng ]; # needed when linking against freetype
  
positive.code: 
  in stdenv.mkDerivation rec {
    name = "freetype-${version}";
    version = "2.9";
  
    meta = with stdenv.lib; {
      description = "A font rendering engine";
  
negative.code: 
    doCheck = true;
  
    postInstall = glib.flattenInclude;
  }
  