anchor.diff:      })
     ];
   
  -  outputs = [ "out" "dev" ];
  +  outputs = [ "out" "dev" "man" ];
   
  -  nativeBuildInputs = [ cmake perl ];
  +  nativeBuildInputs = [ cmake perl groff ];
     propagatedBuildInputs = [ zlib ];
  +  buildInputs = lib.optionals withLZMA [ xz ]
  +    ++ lib.optionals withBzip2 [ bzip2 ]
  +    ++ lib.optionals withOpenssl [ openssl ];
   
     preCheck = ''
       # regress/runtest is a generated file
  
positive.code:   version = "1.7.3";
  
    src = fetchurl {
      url = "https://www.nih.at/libzip/${pname}-${version}.tar.gz";
      sha256 = "1k5rihiz7m1ahhjzcbq759hb9crzqkgw78pkxga118y5a32pc8hf";
    };
  
  
negative.code: , fetchurl
  , perl
  , zlib
  , groff
  , withBzip2 ? false
  , bzip2
  , withLZMA ? false
  , xz
  , withOpenssl ? false
  , openssl
  }:
  
  stdenv.mkDerivation rec {
  