Lua rules

Hello,

I'm starting to work in deepth with Prelude-correlator capabilities and I am
trying to develop some correlation rules using LUA.

The problem is the following, when I try to run prelude-correlator using a
custom rule:

$cat my_rule.lua

print("*** Any global initialization code goes here")
local socket = require("socket")

function my_rule(INPUT)
     print ("*** This function is going to be called when Prelude-Correlator
receive and IDMEF message");
    print(socket._VERSION)
end

Prelude-correlator dies with the following output:

# prelude-correlator
*** Any global initialization code goes here
05 Jun 13:04:29 (process:32375) ERROR: LUA error: error loading module
'socket.core' from file '/usr/lib/lua/5.1/socket/core.so':
 /usr/lib/lua/5.1/socket/core.so: undefined symbol: lua_getmetatable.
(lua.c:186 set_lua_ruleset)
05 Jun 13:04:29 (process:32375) WARNING: error while setting option
'rulesdir'.

However if I try to run my_rule script with lua interpreter, output is:

lua -i my_rule.lua
Lua 5.1.2  Copyright (C) 1994-2007 Lua.org, PUC-Rio
*** Any global initialization code goes here
> my_rule(INPUT);
*** This function is going to be called when Prelude-Correlator receive and
IDMEF message
LuaSocket 2.0.2

Any ideas?

Thank's for all

Nacho

---------------------
Additional data:

Prelude-correlator-0.9.0-beta3
Ubuntu 8.04
Lua 5.1
luasocket-2.0.2
LUA_CPATH=?.so;/usr/lib/lua/5.1/?.so
LUA_PATH=?.lua;/usr/lib/lua/5.1/?.lua;/usr/share/lua/5.1/?.lua
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