can't find MySQL header files

A customer needed curl support, so I decided to upgrade to the latest php4(4.3.10) while I was at it. Suddenly the preg_replace() function is no longer defined. I went back through the docs and noticed the warning at the end of the install script about specifying the path to the MySQL header files if you have mod_perl or mod_php3 also installed, which I do, so I added this to my configure script: --with-mysql=/usr/local/include/mysql I can see the header files clearly in that directory, including mysql.h, yet I keep getting this: checking return type of qsort... (cached) void configure: error: Cannot find MySQL header files under include/mysql I tried changing that to: --with-mysql=/usr/local/include/ thinking maybe it was modifying the path, but still no go. Any ideas? Thanks in Advance, James Smallacombe PlantageNet, Inc. CEO and Janitor up@3.am http://3.am =========================================================================