My ISP just tried to install mod_perl for me on an Apache 1.3 instance and he said that when he put mod_perl in, php4 "choked".

I'm trying to get more information off him, but has anyone heard of an incompatibility?

Update: Here is some more information:

What I am trying to do is make a version of apache 1.x with the following modules. It compiles just fine, and everything works except php4, which causes segfaults. As soon as I take out mod_perl, php4 works fine again. Any suggestions?

mod_ssl
mod_frontpage
mod_perl
mod_php4
mod_so
mod_info
mod_status
mod_rewrite

Update 2: There is a known incompatibility due to the way Perl and PHP set environment variables. There is a workaround available:

* Recompile Perl itself with -DPERL_USE_SAFE_PUTENV, then recompile mod_perl and Apache, in that order.

-OR-

* Replace all PHP calls to putenv() with apache_setenv().

Too quick for you all, but I'll leave this up incase anyone has similiar problems. -Andrew.