anchor.diff:      '';
   
       homepage = http://racket-lang.org/;
  -    license = stdenv.lib.licenses.lgpl2Plus;
  +    license = stdenv.lib.licenses.lgpl2Plus; # and licenses of contained libraries
       maintainers = [ stdenv.lib.maintainers.kkallio ];
       platforms = stdenv.lib.platforms.linux;
     };
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "racket";
    version = "5.2.1";
    name = "${pname}-${version}";
  
    src = fetchurl {
      url = "http://download.racket-lang.org/installers/${version}/${pname}/${name}-src-unix.tgz";
      sha256 = "1v5kvp7vfi4a4bn08jlaga441amlfxpjw9dm6vc1fazwzd72m539";
    };
  
    # Various racket executables do run-time searches for these.
  
negative.code:   '';
  
    meta = {
      description = "A programming language derived from Scheme (formerly called PLT Scheme).";
      longDescription = ''
        Racket (formerly called PLT Scheme) is a programming language derived
        from Scheme. The Racket project has four primary components: the
  