My TC version is TDB 335.50, it is pretty old but i will not change or update this source, my private reasons.
I downloaded Eluna Engine from this site (HERE)
I Copy-paste this folder to Source/src/
In this folder Source/src/ i find txt file called CMakeLists.txt and i edit it, i add this line:
if ( ELUNA )
After this my steps, i compiled Source with no errors.
I have no idea did i have now eluna system in my source and is it work, i didn't tested yet.
I have just one question? Did i do all steps good for compile eluna engine ?