anchor.diff:  
       # Actually build the font:
       cd font
  -    scfbuild -c scfbuild-${variant}.yml
  +    scfbuild ${scfbuildOptions} -c scfbuild-${variant}.yml
     '';
   
     installPhase = ''
  
positive.code:     [ "color"              "black"              ]
      [ "OpenMoji-Color.ttf" "OpenMoji-Black.ttf" ]
      variant;
  
  in stdenv.mkDerivation rec {
    pname = "openmoji";
    version = "12.1.0";
  
    src = fetchFromGitHub {
      owner = "hfg-gmuend";
      repo = pname;
      rev = version;
      sha256 = "11221xw13lsv2znxs295m61cn69wkp5934b0aaddpki2vp6q3n0r";
    };
  
    nativeBuildInputs = [
      scfbuild
    ];
  
    # Some id and data-* attributes in the svg files contain unicode characters,
  
negative.code: { stdenv
  , fetchFromGitHub
  , scfbuild
  , python3Packages
  , variant ? "color" # "color" or "black"
  }:
  
  