anchor.diff:  { stdenv, fetchurl
   , pkgconfig
  -, bison, flex }:
  +, bison, flex
  +, makeWrapper }:
   
   with stdenv.lib;
   stdenv.mkDerivation rec {
  
positive.code:   };
  
    buildInputs =
    [ pkgconfig bison flex ];
  
    meta = {
      description = "The original esoteric programming language";
  
negative.code:     platforms = platforms.linux;
    };
  }
  # TODO: investigate if LD_LIBRARY_PATH needs to be set
  