anchor.diff:    outputs = [ "out" "dev" "info" ];
     outputBin = "dev"; # libassuan-config
   
  -  buildInputs = [ libgpgerror pth ];
  +  buildInputs = [ libgpgerror pth ]
  +    ++ stdenv.lib.optional stdenv.isDarwin gettext;
   
     doCheck = true;
   
  
positive.code:     sed -i 's,#include <gpg-error.h>,#include "${libgpgerror.dev}/include/gpg-error.h",g' $dev/include/assuan.h
    '';
  
    meta = {
      description = "IPC library used by GnuPG and related software";
  
      longDescription = ''
        Libassuan is a small library implementing the so-called Assuan
        protocol.  This protocol is used for IPC between most newer
        GnuPG components.  Both, server and client side functions are
        provided.
      '';
  
      homepage = http://gnupg.org;
      license = stdenv.lib.licenses.lgpl2Plus;
      platforms = stdenv.lib.platforms.all;
    };
  }
  
negative.code: { fetchurl, stdenv, gettext, pth, libgpgerror }:
  
  stdenv.mkDerivation rec {
    name = "libassuan-2.5.1";
  