VLC can't load .so library in Linux

[snark.real]

Hello again!
I've faced some strange problem in Archlinux with lua51-socket-2.0.2-5 library package
When I run lua5.1 interpreter, it loads luasocket correctly although I tested that VLC uses lua 5.1:

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Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio > print(_VERSION) Lua 5.1 > socket = require("socket") > print(socket) table: 0x21f7d50 >

But when I put the same

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socket = require("socket")

in my plugin, VLC gives me

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[0x7f792c09e418] lua generic warning: Error loading script /home/snark/.local/share/vlc/lua/extensions/plugin.lua: 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_gettop [0x7f792c09e418] lua generic error: Could not activate extension!

Then I've tried another library ("lua51-filesystem"),trying to guess if there are problems in luasocket library. It seems, they are not:

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[0x7f05e42a2a18] lua generic warning: Error loading script /home/demax/.local/share/vlc/lua/extensions/cinemate.lua: error loading module 'lfs' from file '/usr/lib/lua/5.1/lfs.so': /usr/lib/lua/5.1/lfs.so: undefined symbol: lua_gettop [0x7f05e42a2a18] lua generic error: Could not activate extension!

BTW, my VLC is version "2.0.5 Twoflower" (27 March 2013)

That's a mystery for me. Could you, pretty please explain and suggest workaround? Or is it a bug?