anchor.diff:        harfbuzz
         libdatrie
         libthai
  -      pcre
  +      pcre pcre2
         xorg.libpthreadstubs
         xorg.libXdmcp
       ];
  
positive.code:       pkg-config
        fribidi
        harfbuzz
        pcre
        xorg.libpthreadstubs
        xorg.libXdmcp
      ] ++ lib.optionals stdenv.isDarwin [ DarwinTools ];
  
negative.code:   glib2 = attrs: {
      nativeBuildInputs = [ pkg-config ]
        ++ lib.optionals stdenv.isDarwin [ DarwinTools ];
      buildInputs = [ gtk2 pcre2 ];
    };
  
    gtk2 = attrs: {
  