anchor.diff:  { stdenv, fetchFromGitHub, fetchpatch, makeWrapper, cmake, llvmPackages, kernel
  -, flex, bison, elfutils, python, pythonPackages, luajit, netperf, iperf, libelf }:
  +, flex, bison, elfutils, python, pythonPackages, luajit, netperf, iperf, libelf
  +, systemtap
  +}:
   
   stdenv.mkDerivation rec {
     version = "0.5.0";
  
positive.code:   buildInputs = [
      llvmPackages.llvm llvmPackages.clang-unwrapped kernel
      elfutils python pythonPackages.netaddr luajit netperf iperf
    ];
  
    patches = [
  
negative.code:     # libelf is incompatible with elfutils-libelf
      ++ stdenv.lib.filter (x: x != libelf) kernel.moduleBuildDependencies;
  
    cmakeFlags =
      [ "-DBCC_KERNEL_MODULES_DIR=${kernel.dev}/lib/modules"
        "-DREVISION=${version}"
        "-DENABLE_USDT=ON"
        "-DENABLE_CPP_API=ON"
      ];
  
    postInstall = ''
      mkdir -p $out/bin $out/share
  