as a fresh owner of MacBook I made raw guide how to build and install therion on Mountain Lion - http://therion.speleo.sk/wiki/doku.php?id=install:osx10.8

Together with Stacho (big thanks) we made compilation/installation possible but currently there is problem with Loch. Loch is running but I am not able to open any file.

After a lot of searching it seems that problem is related to combination of 64 bit OS X 10.8 + wxWindows 2.9

I am not able to build wxWindows 2.8 64bit as wxOSX/Carbon does not support 64bit.