Detecting (g)m4

[A Braunsdorf]

Maybe not quite a bug, and maybe not your fault, but configure
apparently picks the first program called "gm4" in my path, >not<
the first appropriate m4 or gm4.

My problem is that Sun provides a "gm4" that is old and makes nearly
all the bison tests fail.  I have installed a much newer one as
"m4" (what it installs as by default, of course), which is much
earlier in my path and works fine.

Yes, I can tell it which m4 to use, but the canonical name >is<
"m4", so that seems wrong.  And yes, I can make (and have now made)
a link to my m4 called "gm4", but the program's name is "m4", and
I think the detection should be smarter, especially since it really
is version-sensitive.

Thoughts?

ab