When I compiled PHP 4.0.2 for my RH Linux 6.2 Box with apache 1.3.12 and installed it the web server crashed, SO I compiled php as a CGI, and tried to run it from the command line and it won't find the Zend Optimizer because of this warning:

Failed loading /usr/local/Zend/lib/ZendOptimizer.so:  /usr/local/Zend/lib/ZendOptimizer.so: undefined symbol: zend_v_compile_files

  If you need any other information please contact me @ tim@timcrider.com.

  Thanks,
     Tim
--- CONFIGURE OPTIONS --
./configure \
--with-imap \
--with-kerberos \
--with-mysql=/data/mysql \
--with-ldap=/usr/local \
--with-mcrypt=/usr/local \
--enable-ftp \
--with-imap \
--with-xml \
--enable-bcmath \
--with-swf=/usr/lib/swf \
--disable-debugging \
--with-jpeg-dir= \
--with-tiff-dir=/usr \
--with-gd=/usr/src/redhat/BUILD/gd1.3 \
--enable-track-vars
--- ZEND OPTIMIZER FILE --
lib@ ls -la /usr/local/Zend/lib/ZendOptimizer.so
-rwxr-xr-x    1 root     root         125k Jul 31 11:56 /usr/local/Zend/lib/ZendOptimizer.so

--- PHP.INI FILE --
; Zend Optimizer
zend_optimizer.optimization_level=15
zend_extension="/usr/local/Zend/lib/ZendOptimizer.so"
--- ERROR OUTPUT --
php-4.0.2@ php
Failed loading /usr/local/Zend/lib/ZendOptimizer.so:  /usr/local/Zend/lib/ZendOptimizer.so: undefined symbol: zend_v_compile_files