anchor.diff:  { stdenv
  -, autoconf
  -, automake
  -, fetchzip
  -, fetchpatch
  +, fetchurl
   , gettext
  -, gnulib
  -, gnum4
   , lib
  -, libtool
  -, perl
   
  +, cairo
   , freetype
   , giflib
   , glib
   , libjpeg
   , libpng
  +, libspiro
   , libtiff
  +, libtool
  +, libuninameslist
   , libxml2
   , readline
   , uthash
  +, zeromq
   , zlib
   }:
   
  
positive.code:     glib
      libjpeg
      libpng
      libtiff
      libxml2
      readline
      uthash
      zlib
    ];
  
    preConfigure = ''
      sed -i '/func_check_versions ()/{N;s/{/{ return 0/}' bootstrap
  
      unpackFile "${gnulib.src}"
      mv gnulib* gnulib
  
      ./bootstrap --skip-git --gnulib-srcdir=./gnulib
    '';
  
    configureFlags = [
  
negative.code: stdenv.mkDerivation rec {
    name = "fontforge-${version}";
  
    src = fetchurl {
      url = "https://github.com/fontforge/fontforge/releases/download/"
        + "${version}/fontforge-dist-${version}.tar.xz";
      sha256 = "840adefbedd1717e6b70b33ad1e7f2b116678fa6a3d52d45316793b9fd808822";
    };
  
    nativeBuildInputs = [
      gettext
    ];
  
    buildInputs = [
  