anchor.diff:  
     src = fetchzip {
       url = "https://zdoom.org/files/utils/zdbsp/zdbsp-${version}-src.zip";
  -    sha256 = "1j6k0appgjjj3ffbll9hy9nnbqr17szd1s66q08zrbkfqf6g8f0d";
  +    sha256 = "sha256-DTj0jMNurvwRwMbo0L4+IeNlbfIwUbqcG1LKd68C08g=";
       stripRoot = false;
     };
   
  
positive.code:   '';
  
    meta = with lib; {
      description = "ZDoom's internal node builder for DOOM maps";
      homepage = "https://zdoom.org/wiki/ZDBSP";
      license = licenses.gpl2Plus;
      maintainers = with maintainers; [ lassulus siraben ];
      platforms = platforms.unix;
  
negative.code: { lib
  , stdenv
  , fetchzip
  , cmake
  , zlib
  }:
  
  stdenv.mkDerivation rec {
    pname = "zdbsp";
  