anchor.diff:          # export parts of the build environment
           for script in "$out"/bin/*; do
             wrapProgram "$script" \
  -            --set FAUSTLIB "${faust}/lib/faust" \
  -            --set FAUST_LIB_PATH "${faust}/lib/faust" \
  +            --set FAUSTLIB "${faust}/share/faust" \
  +            --set FAUST_LIB_PATH "${faust}/share/faust" \
               --set FAUSTINC "${faust}/include/faust" \
               --prefix PATH : "$PATH" \
               --prefix PKG_CONFIG_PATH : "$PKG_CONFIG_PATH" \
  
positive.code: { stdenv
  , coreutils
  , fetchurl
  , makeWrapper
  , pkgconfig
  , clang
  
negative.code: 
  let
  
    version = "2.1.0";
  
    src = fetchFromGitHub {
      owner = "grame-cncm";
      repo = "faust";
      rev = "v${builtins.replaceStrings ["."] ["-"] version}";
      sha256 = "1pmiwy287g79ipz9pppnkfrdgls3l912kpkr7dfymk9wk5y5di9m";
    };
  
    meta = with stdenv.lib; {
  