anchor.diff:  { fetchurl, fetchzip, stdenv, lua, callPackage, unzip, zziplib, pkgconfig, libtool
   , pcre, oniguruma, gnulib, tre, glibc, sqlite, openssl, expat, cairo
   , perl, gtk2, python, glib, gobjectIntrospection, libevent, zlib, autoreconfHook
  -, libmysql, postgresql
  +, libmysql, postgresql, cyrus_sasl
   , fetchFromGitHub, libmpack, which
   }:
   
  
positive.code:     };
    };
  
    luaevent = buildLuaPackage rec {
      version = "0.4.3";
      name = "luaevent-${version}";
  
negative.code:     meta = with stdenv.lib; {
        homepage = "https://code.google.com/archive/p/luadbi/";
        platforms = stdenv.lib.platforms.unix;
      };
    };
  
  