anchor.diff:  
       # Actually build the font:
       cd font
  -    scfbuild ${scfbuildOptions} -c scfbuild-${variant}.yml
  +    scfbuild -c scfbuild-${variant}.yml
     '';
   
     installPhase = ''
  
positive.code:   };
  
    nativeBuildInputs = [
      scfbuildPatched
    ];
  
    # Some id and data-* attributes in the svg files contain unicode characters,
    # which scfbuild (a python2 program) does not like
    # (https://github.com/13rac1/scfbuild/issues/14).
    # Fortunately, it's only metadata which we can remove:
    postPatch = ''
      sed -Ei 's/(id|data-[^=]*)="[^"]*"//g' black/svg/*.svg color/svg/*.svg
    '';
  
    buildPhase = ''
      # Bash reimplementation of helpers/export-svg-font.js
  
negative.code:     [ "color"              "black"              ]
      [ "OpenMoji-Color.ttf" "OpenMoji-Black.ttf" ]
      variant;
  
  in stdenv.mkDerivation rec {
    pname = "openmoji";
  