Hello,

Fiddling with mkmf, to get it to install a bunch of files in the proper
place; it's impossible without docs, reading the source doesn't help me
either :(

Specifically:
 - what's the third item in the items for $INSTALLFILES
 - How come `make install` creates directories with permissions rwxr-s---
 - How to take *out* the default .so to install
 - is it possible to generate recursive Makefiles?
 - can I check availability of headerfiles and complain when they're not
   found?

Thanks,
Kero.