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=head1 HOW IT WORKS

You pass named parameters to a function, describing to it how to build
and link to the libraries.

It works by trying to compile some code - which defaults to this:

    int main(void) { return 0; }

and linking it to the specified libraries.  If something pops out the end
which looks executable, it gets executed, and if main() returns 0 we know
that it worked.  That tiny program is
built once for each library that you specify, and (without linking) once
for each header file.

If you want to check for the presence of particular functions in a
library, or even that those functions return particular results, then
you can pass your own function body for main() thus:

    check_lib_or_exit(
        function => 'foo();if(libversion() > 5) return 0; else return 1;'