PR4114, 4113, 4082, 4078, (part of) 4096 plus other reports in gcc-bugs

[Benjamin Kosnik]

> The question is: How do we clean this mess up?  At this point, I don't
> even see what is wrong with include/Makefile.am .

Hmm. I think we can either make in-source builds work, or not. If we 
can't, then configure should bomb out: this is what libjava did (does?)

I suspect that an effort should be made to make in-source builds work.