anchor.diff:  { stdenv, lib, pkgs, fetchurl, buildEnv
  -, coreutils, gnused, getopt, git, tree, gnupg, which, procps, qrencode
  -, makeWrapper
  +, coreutils, gnused, getopt, git, tree, gnupg, openssl, which, procps
  +, qrencode , makeWrapper
   
   , xclip ? null, xdotool ? null, dmenu ? null
   , x11Support ? !stdenv.isDarwin
  
positive.code:              -e 's@^GPGS=.*''$@GPG=${gnupg}/bin/gpg2@' \
               -e '/which gpg/ d' \
          tests/setup.sh
      '';
  
      doCheck = false;
  
negative.code:       which
        qrencode
        procps
      ] ++ optional stdenv.isDarwin openssl
        ++ ifEnable x11Support [ dmenu xclip xdotool ]);
  
      postFixup = ''
        # Link extensions env
  