anchor.diff:  
   in stdenv.mkDerivation rec {
     name = "freetype-${version}";
  -  version = "2.9";
  +  version = "2.9.1";
   
     meta = with stdenv.lib; {
       description = "A font rendering engine";
  
positive.code: 
    src = fetchurl {
      url = "mirror://savannah/freetype/${name}.tar.bz2";
      sha256 = "12jcdz1in20yaa55izxalg3hm1pf7nydfrzps5bzb4zgihybmzz6";
    };
  
    propagatedBuildInputs = [ zlib bzip2 libpng ]; # needed when linking against freetype
  
negative.code: 
    doCheck = true;
  
    postInstall = glib.flattenInclude;
  }
  