anchor.diff:      ode
       openal
       openssl.dev
  -    racket
  +    racket_7_9
     ];
     nativeBuildInputs = [ sconsPackages.scons_3_1_2 ];
   
  
positive.code: , ode
  , openal
  , openssl
  , racket
  , sconsPackages
  , zlib
  }:
  
negative.code:     openssl
      zlib
    ];
    racket = racket_7_9;
  in
  stdenv.mkDerivation rec {
    pname = "fluxus";
  