Apache crashes when trying to load PHP4 module, regardless of what I compile in to php4. Note that I have not had any success with b1 or b2 either, too.
Apache is self-compiled 1.3.9, with EAPI (mod_ssl), PHP3.0.12 and Apache/Jserv. Sources from RH SRPM, (created a EAPI patch).

A little copy from my console:
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[root@grumpy php-4.0b3]# /usr/sbin/httpd
[Sat Nov 20 21:56:18 1999] [warn] Loaded DSO lib/apache/mod_jserv.so uses plain
Apache 1.3 DSO, this module might crash under EAPI!
[Sat Nov 20 21:56:19 1999] [warn] Loaded DSO lib/apache/libphp3.so uses plain Apache 1.3 DSO, this module might crash under EAPI!
Segmentation fault
[root@grumpy php-4.0b3]# gdb /usr/sbin/httpd
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This GDB was configured as "i386-redhat-linux"...
(no debugging symbols found)...
(gdb) run
Starting program: /usr/sbin/httpd
[Sat Nov 20 21:56:26 1999] [warn] Loaded DSO lib/apache/mod_jserv.so uses plain
Apache 1.3 DSO, this module might crash under EAPI!
[Sat Nov 20 21:56:28 1999] [warn] Loaded DSO lib/apache/libphp3.so uses plain Apache 1.3 DSO, this module might crash under EAPI!
 
Program received signal SIGSEGV, Segmentation fault.
0x20636973 in ?? ()
(gdb) bt
#0  0x20636973 in ?? ()
#1  0x404ae9a8 in sapi_startup (sf=0x405515c0) at SAPI.c:79
#2  0x404f1402 in php_init_handler (s=0x8093af4, p=0x8093acc) at mod_php4.c:503
#3  0x8054b21 in ap_init_modules ()
#4  0x805c25e in main ()
#5  0x400b91eb in __libc_start_main (main=0x805bff0 <main>, argc=1,
    argv=0xbffffd04, init=0x804efc8 <_init>, fini=0x807b35c <_fini>,
    rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffcfc)
    at ../sysdeps/generic/libc-start.c:90
(gdb)
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Dunno. EAPI trouble? Maybe.

PHP4 was configured with: ./configure --with-apxs=/usr/sbin/apxs