anchor.diff:      src = fetchgit { inherit url rev sha256; };
       nativeBuildInputs = [ pkgconfig ];
       buildInputs = [ elfutils gettext python2 python2Packages.setuptools ];
  -    # FIXME: Workaround for bug in kbuild, where quoted -I"/foo" flags would get mangled in out-of-tree kbuild dirs
  -    postPatch = ''
  -      substituteInPlace buildrun.cxx --replace \
  -        'o << "EXTRA_CFLAGS += -I\"" << s.runtime_path << "\"" << endl;' \
  -        'o << "EXTRA_CFLAGS += -I" << s.runtime_path << endl;'
  -    '';
       enableParallelBuilding = true;
     };
   
  
positive.code: let
    ## fetchgit info
    url = git://sourceware.org/git/systemtap.git;
    rev = "4051c70c9318c837981384cbb23f3e9eb1bd0892";
    sha256 = "0sd8n3j3rishks3gyqj2jyqhps7hmlfjyz8i0w8v98cczhhh04rq";
    version = "2017.10.18";
  
    inherit (kernel) stdenv;
    inherit (stdenv) lib;
  
negative.code:   };
  } ''
    mkdir -p $out/bin
    for bin in $stapBuild/bin/*; do
      ln -s $bin $out/bin
    done
    rm $out/bin/stap $out/bin/dtrace
  