anchor.diff: -{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config
  -, libmysqlclient, libaio
  +{ lib
  +, stdenv
  +, fetchFromGitHub
  +, autoreconfHook
  +, pkg-config
  +, libmysqlclient
  +, libaio
  +, luajit
  +# For testing:
  +, testers
  +, sysbench
   }:
   
   stdenv.mkDerivation rec {
  
positive.code: 
    enableParallelBuilding = true;
  
    meta = {
      description = "Modular, cross-platform and multi-threaded benchmark tool";
      homepage = "https://github.com/akopytov/sysbench";
      license = lib.licenses.gpl2;
      platforms = lib.platforms.linux;
    };
  }
  
negative.code:   version = "1.0.20";
  
    nativeBuildInputs = [ autoreconfHook pkg-config ];
    buildInputs = [ libmysqlclient luajit ] ++ lib.optionals stdenv.isLinux [ libaio ];
  
    src = fetchFromGitHub {
      owner = "akopytov";
  