@ montag dp

When I install liblua5.1-0-dev, synaptic shows lua5.1.pc as an installed file.

Found with locate after updating database.
Code:
sudo updatedb && locate lua5.1.pc
glen@Raring:~$ sudo updatedb && locate lua5.1.pc
[sudo] password for glen:
/usr/lib/x86_64-linux-gnu/pkgconfig/lua5.1.pc