anchor.diff:      homepage = http://racket-lang.org/;
       license = licenses.lgpl3;
       maintainers = with maintainers; [ kkallio henrytill vrthra ];
  -    platforms = [ "x86_64-linux" ];
  +    platforms = [ "x86_64-darwin" "x86_64-linux" ];
     };
   }
  
positive.code:   ];
  
    buildInputs = [ fontconfig libffi libtool makeWrapper sqlite ]
      ++ stdenv.lib.optionals stdenv.isDarwin [ CoreFoundation ];
  
    preConfigure = ''
      unset AR
  
negative.code: { stdenv, fetchurl, makeFontsConf, makeWrapper
  , cairo, coreutils, fontconfig, freefont_ttf
  , glib, gmp, gtk2, libedit, libffi
  , libiconv
  , libjpeg
  , libpng, libtool, mpfr, openssl, pango, poppler
  , readline, sqlite
  , disableDocs ? false
  