anchor.diff:  
     enableParallelBuilding = false;
   
  +  postFixup = lib.optionalString stdenv.isDarwin ''
  +    wrapProgram $out/bin/drracket --prefix DYLD_LIBRARY_PATH : ${xorg.libX11}/lib
  +  '';
   
     meta = with lib; {
       description = "A programmable programming language";
  
positive.code:     license = with licenses; [ asl20 /* or */ mit ];
      maintainers = with maintainers; [ kkallio henrytill vrthra ];
      platforms = [ "x86_64-darwin" "x86_64-linux" "aarch64-linux" ];
      broken = stdenv.isDarwin; # No support yet for setting FFI lookup path
    };
  }
  
negative.code: , libGL
  , libGLU
  , libjpeg
  , xorg
  , ncurses
  , libpng, libtool, mpfr, openssl, pango, poppler
  , readline, sqlite
  