What *does* work is editing the Makefile to replace the line
.pm.inl:
... with
Blabla.inl:
I think there's at least one way of having the Makefile.PL generate a Makefile with that change in place.
I don't really understand MakeMaker but I believe you could do something like have the Makefile.PL postamble section run (eg) a perl script that rewrites the Makefile, making that amendment in the process - so the user doesn't have to do anything out of the ordinary. There might even be a better way of getting the Makefile.PL to do what's needed. Ken has a better understanding of MakeMaker (if he's follwing this thread).
Perhaps a post to the MakeMaker mailing list will produce the answer if you don't get it here (see http://lists.perl.org).
Cheers, Rob
