I'm trying to upgrade Apache to the latest version from an old version from
a RedHat 8.0 install.

In the docs it says this:

$ ./configure --prefix=PREFIX
$ make
$ make install
$ PREFIX/bin/apachectl start

Obviously, I need to customize all of the arguments in the configure script
to match what's already on the system. This is where I'm completely
stumped. How can I find out what to put, and which variables to put?
Where can I find out what RedHat 8.0 came with?