configure is busted when building with HP's compiler.
"cc -Ac" is ancient and broken, "cc -Aa" is too anal to
compile it's own system headers, and "cc -Ae" breaks
autoconf.
The problem is the same one as outlined here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12100
but in our case, it hits a whole lot of functions.

(basically: AC_CHECK_FUNCS expands to code that ends up
#including limits.h, which ends up including
sys/time.h, which breaks all checks for the various
time related bits.)

The GCC people worked around it with their own version
of the appropriate magic.