I've finally took the time to install the FrontPage extensions on my home
box to test why several people reported it crashes for them.
First, I've been immediately able to reproduce it. Patching apache and
adding the FrontPage module caused every PHP page to crash and dump core
with no backtrace whatsoever.
There was a good reason for that though - since I applied the frontpage
patch *after* compiling the PHP module, and since the frontpage patch
changes several Apache data structures, the PHP library was incompatible
with the rest of Apache.
The solution is simple. Just clean your PHP compilation with make clean,
and remake it. It works fine afterwards.
Zeev
p.s.: I haven't actually tested the FrontPage extensions work, but since
they're not related to PHP in any way, they shouldn't work any better or
worse w/ or w/o PHP compiled in. If you can confirm this works for you,
it'll be appreciated.