I tried this on two computers, but received the same result: when I trying to start Apache with PHP and Oracle support, it crashes, when I tried to do the same without Oracle, it works fine.
My configuration is:
./configure --with-apxs=/usr/local/apache/bin/apxs --with-mod_charset --enable-force-cgi-redirect\
 --with-oci8=/usr/local/oracle/8i/u01/app/oracle/product/8.1.6 --enable-track-vars=yes --enable-safe-mode=no\
 --enable-discard-path --with-config-file-path=/usr/local/apache/conf\
 --enable-debug --enable-sigchild --enable-magic-quotes\
 --enable-calendar --enable-dbase --enable-filepro \
 --enable-ftp --with-pdflib=/usr/local --with-zlib-dir=/usr/local/lib --with-jpeg-dir=/usr/local/lib --with-png-dir=/usr/local/lib --with-tiff-dir=/usr/local/lib --enable-trans-sid\
 --without-mysql --enable-shared

After the core dumps, over the GDB I received:

GNU gdb 19991004
This GDB was configured as "i386-redhat-linux"...
Core was generated by `/usr/local/apache/bin/httpd'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libcrypt.so.1...done.
Reading symbols from /lib/libdb.so.3...done.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
Reading symbols from /lib/libnss_files.so.2...done.
Reading symbols from /usr/local/apache/libexec/mod_mmap_static.so...done.
Reading symbols from /usr/local/apache/libexec/mod_vhost_alias.so...done.
Reading symbols from /usr/local/apache/libexec/mod_env.so...done.
Reading symbols from /usr/local/apache/libexec/mod_log_config.so...done.
Reading symbols from /usr/local/apache/libexec/mod_log_agent.so...done.
Reading symbols from /usr/local/apache/libexec/mod_log_referer.so...done.
Reading symbols from /usr/local/apache/libexec/mod_mime_magic.so...done.
Reading symbols from /usr/local/apache/libexec/mod_mime.so...done.
Reading symbols from /usr/local/apache/libexec/mod_negotiation.so...done.
Reading symbols from /usr/local/apache/libexec/mod_status.so...done.
Reading symbols from /usr/local/apache/libexec/mod_info.so...done.
Reading symbols from /usr/local/apache/libexec/mod_include.so...done.
Reading symbols from /usr/local/apache/libexec/mod_autoindex.so...done.
Reading symbols from /usr/local/apache/libexec/mod_dir.so...done.
Reading symbols from /usr/local/apache/libexec/mod_cgi.so...done.
Reading symbols from /usr/local/apache/libexec/mod_asis.so...done.
Reading symbols from /usr/local/apache/libexec/mod_imap.so...done.
Reading symbols from /usr/local/apache/libexec/mod_actions.so...done.
Reading symbols from /usr/local/apache/libexec/mod_speling.so...done.
Reading symbols from /usr/local/apache/libexec/mod_userdir.so...done.
Reading symbols from /usr/local/apache/libexec/mod_alias.so...done.
Reading symbols from /usr/local/apache/libexec/mod_rewrite.so...done.
Reading symbols from /usr/local/apache/libexec/mod_access.so...done.
Reading symbols from /usr/local/apache/libexec/mod_auth.so...done.
Reading symbols from /usr/local/apache/libexec/mod_auth_anon.so...done.
Reading symbols from /usr/local/apache/libexec/mod_auth_dbm.so...done.
Reading symbols from /usr/local/apache/libexec/mod_auth_db.so...done.
Reading symbols from /usr/local/apache/libexec/mod_digest.so...done.
Reading symbols from /usr/local/apache/libexec/libproxy.so...done.
Reading symbols from /usr/local/apache/libexec/mod_cern_meta.so...done.
Reading symbols from /usr/local/apache/libexec/mod_expires.so...done.
Reading symbols from /usr/local/apache/libexec/mod_headers.so...done.
Reading symbols from /usr/local/apache/libexec/mod_usertrack.so...done.
Reading symbols from /usr/local/apache/libexec/mod_example.so...done.
Reading symbols from /usr/local/apache/libexec/mod_unique_id.so...done.
Reading symbols from /usr/local/apache/libexec/mod_setenvif.so...done.
Reading symbols from /usr/local/apache/libexec/libphp4.so...done.
Reading symbols from /usr/lib/libgdbm.so.2...done.
Reading symbols from /lib/libpam.so.0...done.
Reading symbols from /usr/lib/libpdf.so.1...done.
Reading symbols from /usr/lib/libtiff.so.3...done.
Reading symbols from /usr/lib/libpng.so.2...done.
Reading symbols from /usr/lib/libjpeg.so.62...done.
Reading symbols from /usr/local/oracle/8i/u01/app/oracle/product/8.1.6/lib/libclntsh.so.8.0...done.
Reading symbols from /usr/lib/libgd.so.1...done.
Reading symbols from /lib/libresolv.so.2...done.
Reading symbols from /lib/libnsl.so.1...done.
Reading symbols from /usr/lib/libz.so.1...done.
Reading symbols from /usr/local/oracle/8i/u01/app/oracle/product/8.1.6/lib/libwtc8.so...done.
Reading symbols from /lib/libpthread.so.0...done.
#0  0x40a0d774 in ?? ()
(gdb) bt
#0  0x40a0d774 in ?? ()
#1  0x401352eb in __getpwnam_r (name=0x80c1d74 "nobody", resbuf=0x40196240, buffer=0x80c7688 "nobody", buflen=1024,
    result=0xbfffd7ac) at ../nss/getXXbyYY_r.c:182
#2  0x40134ba0 in getpwnam (name=0x80c1d74 "nobody") at ../nss/getXXbyYY.c:123
#3  0x806be7e in ap_uname2id ()
#4  0x805944e in set_user ()
#5  0x80549fa in invoke_cmd ()
#6  0x8055393 in ap_handle_command ()
#7  0x8055427 in ap_srm_command_loop ()
#8  0x8055830 in ap_process_resource_config ()
#9  0x80560f2 in ap_read_config ()
#10 0x805f951 in standalone_main ()
#11 0x80601c3 in main ()
#12 0x400bc9cb in __libc_start_main (main=0x805fe7c <main>, argc=1, argv=0xbffff9c4, init=0x804e870 <_init>,
    fini=0x809419c <_fini>, rtld_fini=0x4000ae60 <_dl_fini>, stack_end=0xbffff9bc) at ../sysdeps/generic/libc-start.c:92

Thank You for PHP and Your support

Sincerely,
Tauras Paliulis