I MUST COMPILE a new (1.25) Mate desktop into ubuntu-mate 18.04

If you can point me a script that uses the sources on Mate 1.25 sources, that would be much appreciated. Or even a detailed discussion of how to create such a script. Websearching doesn't produce anything. No other recommendation or solution is useful. Trying a 1.24 PPA screwed things up for me, and at least 1 other person.