anchor.diff:    rm $out/bin/stap
     makeWrapper $stapBuild/bin/stap $out/bin/stap \
       --add-flags "-r $kernelBuildDir" \
  -    --prefix PATH : ${lib.makeBinPath [ stdenv.cc.cc elfutils gnumake ]}
  +    --prefix PATH : ${lib.makeBinPath [ stdenv.cc.cc binutils elfutils gnumake ]}
   ''
  
positive.code:   stapBuild = stdenv.mkDerivation {
      name = "systemtap-${version}";
      src = fetchgit { inherit url rev sha256; };
      buildInputs = [ elfutils pkgconfig gettext ];
      enableParallelBuilding = true;
    };
  
  
negative.code: { fetchgit, pkgconfig, gettext, runCommand, makeWrapper
  , elfutils, kernel, gnumake, python2, pythonPackages, binutils }:
  let
    ## fetchgit info
    url = git://sourceware.org/git/systemtap.git;
    rev = "276ed27a3cc64531542ab73bb36bb04784e79bbc";
    sha256 = "11967dx3cjs96v3ncfljw0h7blsgg9wm8g9z2270q9a90988g2c2";
    version = "2017-02-04";
  
    inherit (kernel) stdenv;
    inherit (stdenv) lib;
  