Can successfully compile and install, but compiled module doesn't work

[MaddieM4]

I can compile and install lycrypto.so, but when I try to require it, I get this:

> lcrypto = require 'lcrypto'
error loading module 'lcrypto' from file '/usr/local/lib/lua/5.1/lcrypto.so':
 /usr/local/lib/lua/5.1/lcrypto.so: undefined symbol: luaopen_lcrypto
stack traceback:
 [C]: ?
 [C]: in function 'require'
 stdin:1: in main chunk
 [C]: ?

Any idea what might be causing this? I'm on Debian Wheezy.

[evcordeiro]

the module and library name should be "crypto" without the "l"