I am installing PHP on a Red Hat 7.2 server and I can't figure out what is that path to Apache. When ever I try to configure PHP I get this error:

Invalid Apache directory - unable to find httpd.h under 'whatever'

I tried lots of diffrent paths that I thought might work. Does anyone know where the default Apache directory is under Red Hat? Thanks!

try this
locate httpd.h

If you use Apache shipped with RedHat, try installing apache-devel package, and use --with-apxs instead of --with-apache.