anchor.diff:    '';
   
     meta = {
  -    description = "Racket (formerly called PLT Scheme) is a programming language derived from Scheme.";
  +    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
  
positive.code:     '';
  
      homepage = http://racket-lang.org/;
      license = stdenv.lib.licenses.lgpl2Plus;
      maintainers = [ stdenv.lib.maintainers.kkallio ];
      platforms = stdenv.lib.platforms.linux;
    };
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "racket";
    version = "5.3.3";
    name = "${pname}-${version}";
  
    src = fetchurl {
      url = "http://download.racket-lang.org/installers/${version}/${pname}/${name}-src-unix.tgz";
      sha256 = "1qp0fmsh4dkxvlj35xnwdcf4m97jcf927cwhnckjicqx1lfa0wj7";
    };
  
    # Various racket executables do run-time searches for these.
  