Using Alien in Ubuntu 10.10

[Luciano de Souza <luchyanus@...>]

Hi listers,

In a Ubuntu 10.10, I have tried to install Alien library. Let me show 
you the output:

$ luarocks install alien

Installing http://luarocks.org/repositories/rocks/alien-0.6.1-1.rockspec...

Error: Could not find expected file libffi.a, or libffi.so for FFI -- 
you may have to install FFI in your system and/or set the FFI_DIR variable

I tried "sudo apt-get install libfii", but the package was not found.

My question is: is it possible to use Alien under Linux? What should I do?
I tested this library in Windows and I really enjoyed. It would be very 
nice to use it also in Linux.
Best regards,
Luciano