hellobind.cpp:
    1 extern "C"
    2 {
    3 #include <lua5.1/lua.h>
    4 }
    5 #include <iostream>
    6 #include <luabind/lua_include.hpp>
    7 #include <luabind/luabind.hpp>
    8
    9 void greet()
   10 {
   11     std::cout << "hello world!\n";
   12 }
   13
   14 extern "C" int init(lua_State* L)
   15 {
   16     using namespace luabind;
   17
   18     open(L);
   19
   20     module(L)
   21     [
   22         def("greet", &greet)
   23     ];
   24
   25     return 0;
   26 }

building:
$ g++ hellobind.cpp -llua5.1 -lluabind -I/usr/include/lua5.1/ -c -fPIC
$ g++ -shared -Wl,-soname,libhellobind.so.0 -o libhellobind.so.0.0 hellobind.o

test.lua:
    1 local path = "libhellobind.so.0.0"
    2 local f = package.loadlib(path, "init")
    3 greet()


output:
$ lua test.lua
lua: test.lua:3: attempt to call global 'greet' (a nil value)
stack traceback:
	test.lua:3: in main chunk
	[C]: ?

other info:
$ uname -a
Linux gmans-magicbox 3.5.3-custom #2 SMP Sun Aug 26 09:02:47 CEST 2012 x86_64 GNU/Linux
$ gcc --version
gcc (Debian 4.7.1-7) 4.7.1
$ lua -v
Lua 5.1.5  Copyright (C) 1994-2012 Lua.org, PUC-Rio