anchor.diff: -{ lib, stdenv, fetchFromGitHub, cmake, flex, bison }:
  +{ lib, stdenv, fetchFromGitHub, cmake, flex, bison, systemd }:
   
   stdenv.mkDerivation rec {
     pname = "fluent-bit";
  
positive.code:   meta = with lib; {
      description = "Log forwarder and processor, part of Fluentd ecosystem";
      homepage = "https://fluentbit.io";
      maintainers = with maintainers; [
        samrose
      ];
      license = licenses.asl20;
      platforms = platforms.unix;
    };
  
negative.code: 
    nativeBuildInputs = [ cmake flex bison ];
  
    buildInputs = lib.optionals stdenv.isLinux [ systemd ];
  
    cmakeFlags = [ "-DFLB_METRICS=ON" "-DFLB_HTTP_SERVER=ON" ];
  
    patches = lib.optionals stdenv.isDarwin [ ./fix-luajit-darwin.patch ];
  
    # _FORTIFY_SOURCE requires compiling with optimization (-O)
    NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-O";
  
    outputs = [ "out" "dev" ];
  
    postPatch = ''
      substituteInPlace src/CMakeLists.txt \
  