Install G729 codec problems

Tearing my hair out here. Been trying to install the G729 codec and all the links I can find tell me to navigate to /usr/lib/asterisk/modules and place the codec there. The problem is on my Centos freePBX system that directory does not exist. Does anyone have any ideas

Greatly appreciated

If this is a genuine Digium G729 then contact them, they have always been very helpful when I have needed them