make flavor checks?

[mcmahill]

Anyone have any good macros for checking characteristics of make?  Ie, I'd
like to see something like:

checking for gmake... no
checking for make... yes
checking if make is GNU make... no
checking if make accepts [foo]...

etc.

I'm wanting to use autoconf to produce a set of make file fragments that
are configured for use with a particular make and need to sort out various
differences in make conditionals and include statements, etc.

Thanks for any suggestions/examples.

-dan