While starting Apache with SSL (PHP module loaded from the SSL group), libphp4.so generate error:
undefined symbol: mysql_field_count .   then Apache will not start.

Compile modules are:  
            ./configure \ 
            --with-apxs=/usr/local/apache/bin/apxs \ 
            --with-config-file-path=/etc/httpd \ 
            --enable-safe-mode \ 
            --with-mysql=/usr/local/mysql \ 
            --with-xml \ 
            --with-openssl=/usr/local/ssl \ 
            --enable-track-vars \ 
            --with-system-regex \ 
            --with-imap=/usr/local/imap-4.7c 

MySQL version is mysql-3.23.21-beta-pc-linux-gnu-i686 from general binary package. Untarred and moved
to /usr/local/mysql. The program runs fine.

The OS is Red Hat 6.2 with 2.4.0-test2 kernel installed. 

In addition, libphp4 also generate another error, which is fixed by the following: 
undefined symbol: gss_mech_krb5

load "export LD_PRELOAD=/usr/kerberos/lib/libgssapi_krb5.so" fixed the gss_mech_krb5 problem.

php.ini is the original one from php.ini-dist.