PHP 4.0 Segfault under RH6.1

Like before - all versions of php 3 work fine. I compiled 4.0 with these configure options --with-mysql --with-apxs=/usr/local/apache/bin/apxs and child httpd process gets segfaults on all php stuff. I added --enable-debug to the above and here is the gdb backtrace: (gdb) run httpd -X Starting program: /usr/local/apache/bin/httpd httpd -X Program received signal SIGSEGV, Segmentation fault. 0x4044b7d2 in ?? () from /usr/local/apache/libexec/libphp4.so (gdb) bt #0 0x4044b7d2 in ?? () from /usr/local/apache/libexec/libphp4.so #1 0x807f8f3 in ap_invoke_handler () #2 0x8092f09 in process_request_internal () #3 0x8092f6c in ap_process_request () #4 0x808a80e in child_main () #5 0x808a99c in make_child () #6 0x808aaf9 in startup_children () #7 0x808b126 in standalone_main () #8 0x808b8b3 in main () #9 0x400d31eb in __libc_start_main (main=0x808b56c <main>, argc=3, argv=0xbffffd04, init=0x8062548 <_init>, fini=0x813794c <_fini>, rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffcfc) at ../sysdeps/generic/libc-start.c:90 My guess is something about the redhat libraries. PHP 4.0 works fine for me under slackware and debian, but my client insists on RH. Ideas? cheers