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