PHP 5 update

I recently updated from php 5.2.5 to 5.2.6 via custombuild and now i get an error like so:

This is when i try start apache (the httpd service).
If I comment out the libxml include in httpd.conf, it loads fine but surely libxml is needed for something.

So my question is, of course, how can I get this to work correctly with libxml?

edit:
ok i ran custombuild for libxml2 then changed the httpd.conf to point to libxml2.so rather than lib64/libxml2.so.2
now it works but am i using the right version?
i have like 20 copies of libxml

edit 2:
also when i "service restart httpd", it shows OK for stopping then it shows nothing for starting but it does start.