anchor.diff:  { stdenv
  -, cmake
  +, perl
   , pkg-config
  -, ninja
   , fetchFromGitHub
   , fetchpatch
   , zip
  
positive.code:   ];
  
    nativeBuildInputs = [
      cmake
      pkg-config
      ninja # make fails, unable to find test2.zip
      zip
      python3
      xmlto
  
negative.code: 
    checkInputs = [
      unzip
    ];
  
    # tests are broken (https://github.com/gdraheim/zziplib/issues/20),
  