anchor.diff: -{ stdenv, fetchurl, ncurses, xlibsWrapper, bzip2, zlib, openssl
  +{ stdenv, fetchurl, fetchpatch, ncurses, xlibsWrapper, bzip2, zlib, openssl
   , gpm
   , # Incompatible licenses, LGPLv3 - GPLv2
     enableGuile        ? false,                                         guile ? null
  
positive.code: assert enableGuile -> guile != null;
  assert enablePython -> python != null;
  
  stdenv.mkDerivation {
    name = "elinks-0.12pre6";
  
    src = fetchurl {
      url = "http://elinks.or.cz/download/elinks-0.12pre6.tar.bz2";
      sha256 = "1nnakbi01g7yd3zqwprchh5yp45br8086b0kbbpmnclabcvlcdiq";
    };
  
  
negative.code:     ./openssl-1.1.patch
    ];
  
    postPatch = (stdenv.lib.optional stdenv.isDarwin) ''
      patch -p0 < ${fetchpatch {
        url = "https://raw.githubusercontent.com/macports/macports-ports/72bed7749e76b9092ddd8d9fe2d8449c5afb1d71/www/elinks/files/patch-perl.diff";
        sha256 = "14q9hk3kg2n2r5b062hvrladp7b4yzysvhq07903w9kpg4zdbyqh";
      }}
    '';
  
    buildInputs = [ ncurses xlibsWrapper bzip2 zlib openssl spidermonkey ]
      ++ stdenv.lib.optional stdenv.isLinux gpm
      ++ stdenv.lib.optional enableGuile guile
      ++ stdenv.lib.optional enablePython python
      ++ stdenv.lib.optional enablePerl perl
  