As of now none of the mol ebuilds in the tree supports modular X dependencies.
Modular X is pretty damn new stuff and not for 24 hours in the tree. It is not stable, so it is not urgent and we will work on a resolution.
Almost every package isn't modular X ready. It will take a bit of time to settle. For now please put the correct provide and please tell us if something isn't working correctly with modular X (here it is working quite fine)
We should look into that LATER
Modular X will be entering ~arch in about 4 days, so mol will be broken for anyone on ~ppc at that point if not fixed.
I'll take care of this one and the other ppc only ebuilds tomorrow, I've just installed modular X (works great on my PB G4 500 with Rage128).
Fixed in CVS.