anchor.diff:    passthru = {
       inherit configVersion;
     };
  -  
  +
     meta = with stdenv.lib; {
       description = "A library for font customization and configuration";
       homepage = http://fontconfig.org/;
  
positive.code:   # Add a default font for non-nixos systems. fontbhttf is only about 1mb.
    postInstall = ''
      cd "$out/etc/fonts" && tar xvf ${infinality_patch}
      xsltproc --stringparam fontDirectories "${fontbhttf}" \
        --stringparam fontconfig "$out" \
        --stringparam fontconfigConfigVersion "${configVersion}" \
  
negative.code:         sha256 = "1fm5xx0mx2243jrq5rxk4v0ajw2nawpj23399h710bx6hd1rviq7";
        }
      ;
  
    patches = [(fetchpatch {
      url = "http://cgit.freedesktop.org/fontconfig/patch/?id=f44157c809d280e2a0ce87fb078fc4b278d24a67";
      sha256 = "19s5irclg4irj2yxd7xw9yikbazs9263px8qbv4r21asw06nfalv";
    })];
  
    propagatedBuildInputs = [ freetype ];
    buildInputs = [ pkgconfig libxslt expat ];
  