I compiled PHP4 RC1 with the following parameters:

./configure --with-apache=/usr/local/apache --with-gd=/usr/local/gd1.2 --with-mysql=/usr/local/mysql --enable-track-vars=yes --enable-magic-quotes=yes

and then proceeded to compile apache with the following;

./configure --prefix=/path/to/apache --enable-module=src/modules/php4/libphp4.a --enable-shared=max

Everything went on fine and everything compiled fine (with some minor source code changes) and when I try to start apache, it will just fail to load the php4 module.

BTW, I also used the parameter --enable-bc (or something like that to enable BC math taken from php3) and php4 rc1 just failed to compile.

I HAVE a lot of problems with the DL functions.  One of the main problems when loading the module from apache is the dl_load function.