[Freeswitch-users] Version of Lua with FS1.4

I installed FS1.4 on an Ubuntu14.04 box the other day and found that it seemed to be using Lua5.2. After hunting around for a bit, I managed to find Lua 5.2 versions of the modules we use. I then wiped the machine and attempted another build, and it used Lua 5.1! I'm confused as to what I've done differently. Is there a preferred Lua version for 1.4?