anchor.diff:      "--ipv6"
     ];
   
  -  NIX_CFLAGS_COMPILE = toString (makeSDLFlags [ SDL SDL_gfx ]);
  -
     enableParallelBuilding = true;
   
     doCheck = true;
  
positive.code:     # test exec2-3.2 fails depending on platform or sandboxing (?)
      rm tests/exec2.test
    '';
  
    postInstall = ''
      ln -sr $out/lib/libjim.so.${version} $out/lib/libjim.so
  
negative.code: { lib
  , stdenv
  , fetchFromGitHub
  
  , asciidoc
  , pkg-config
  , inetutils
  
  , sqlite
  , readline
  , SDL
  , SDL_gfx
  }:
  
  stdenv.mkDerivation rec {
    pname = "jimtcl";
    version = "0.81";
  
    src = fetchFromGitHub {
      owner = "msteveb";
      repo = "jimtcl";
      rev = version;
      sha256 = "sha256-OpM9y7fQ+18qxl3/5wUCrNA9qiCdA0vTHqLYSw2lvJs=";
    };
  
    nativeBuildInputs = [
      pkg-config
      asciidoc
    ];
  
  