No, I'm probably not being clear enough. What I'm suggesting they do is supply a legacy Makefile.PL that works totally independant of having M::B installed at all. Even if it's named something else (e.g. Makefile.Legacy.PL) to keep it out of the way, that would be fine. In my case perhaps M::B would have worked to generate one with the "traditional" option -- I don't know. I didn't want to find out because it failed 'make test', I couldn't fix it, so I didn't trust it. In my current work environment I've found I need to be very conservative, so YMMV.