Conditional linking

[Pierre Abbat]

I am writing a program that is compiled with popt if present, and falls back to
a simple option parser if it isn't. I got that much to work, using
AC_CHECK_HEADERS(popt.h) in configure.in . I am stumped, however, how to get it
to link with popt if and only if it compiled with popt. How do I do this?

phma