anchor.diff:    };
   
     nativeBuildInputs = [
  -    scfbuild
  +    scfbuild-with-fontforge-20201107
       nodejs
       nodePackages.glob
       nodePackages.lodash
  
positive.code: { lib
  , stdenv
  , fetchFromGitHub
  , scfbuild
  , nodejs
  , nodePackages
  , python3Packages
  
negative.code:     [ "color"              "black"              ]
      [ "OpenMoji-Color.ttf" "OpenMoji-Black.ttf" ]
      variant;
  
    # With newer fontforge the build hangs, see
    # https://github.com/NixOS/nixpkgs/issues/167869
    # Patches etc taken from
    # https://github.com/NixOS/nixpkgs/commit/69da642a5a9bb433138ba1b13c8d56fb5bb6ec05
    fontforge-20201107 = fontforge.overrideAttrs (old: rec {
      version = "20201107";
      src = fetchFromGitHub {
        owner = "fontforge";
        repo = "fontforge";
        rev = version;
        sha256 = "sha256-Rl/5lbXaPgIndANaD0IakaDus6T53FjiBb45FIuGrvc=";
      };
      patches = [
        (fetchpatch {
          url = "https://salsa.debian.org/fonts-team/fontforge/raw/76bffe6ccf8ab20a0c81476a80a87ad245e2fd1c/debian/patches/0001-add-extra-cmake-install-rules.patch";
          sha256 = "u3D9od2xLECNEHhZ+8dkuv9818tPkdP6y/Tvd9CADJg=";
        })
        (fetchpatch {
          url = "https://github.com/fontforge/fontforge/commit/69e263b2aff29ad22f97f13935cfa97a1eabf207.patch";
          sha256 = "06yyf90605aq6ppfiz83mqkdmnaq5418axp9jgsjyjq78b00xb29";
        })
      ];
      buildInputs = old.buildInputs ++ [ libuninameslist ];
    });
    scfbuild-with-fontforge-20201107 = scfbuild.override (old: {
      fontforge = fontforge-20201107;
    });
  
  in stdenv.mkDerivation rec {
    pname = "openmoji";
  