GNU Makefiles, Portable ?

[Tristan Van Berkom]

Can I compile GNU Make (ummm, say 3.79) on many platforms ?

I'd like to argue that GNU Makefiles *are* portable because they
will work on any system that has GNU Make installed (assuming
that all of thier shell stuff is portable and that thier filenames
don't contain evil whitespaces).

Could you kindly either provide me a list of platforms supported by
GNU Make, point me to a website with this information or point me
to a file in the Make package containing this information ?

TIA,
                          -Tristan

NOTE:
    This is a re-post of a message sent to "address@hidden"
*with* the quotes, my mailer added them, and sent the message
without errors but it doesn't seem to have made it through...

So if you get this twice, sorry is me ;-)