Easy Install (not reccomended, just for reference):

the skinny, for the lazy and impatient (not meeting usefull objectives)

Quite simply put, there is one big difference between Apache 1.x era, and Apache 2.x era- a build-configuration file. This creates the configure shell script which is proper for your platform, once you download and unpack the source, check it out:

% /path/to/unpacked/httpd_2.x_source/buildconf

This is the new way of doing things, as the configuration file has a great deal of apache-specific configuration directives (which depend on the context of the operating system to even exist).
So, a easy/lazy install is as follows:

% ./buildconf
% ./configure
% make
% sudo make install

% apachectl start

And that does it- BUT, this doesn't do a good Zope Developer any good. It doesn't have SSL support, and will more-than likely be overwritten by your next Apple Software/Security Update.
Read on...