You’d like to add mod_security to your custom apache+mod_php build. The package requires a recent version of libxml2 which must be installed in parallel. Once compiled, httpd is unable to start as a result of missing symbols.
I’ve spent many moons diagnosing nagging air conditioning issues with a 1992 Chevy Silverado K1500 .
Research indicates that many other owners have similar issues.
In my case, a conversion from R12 had already been performed.