There are several other Perl modules that you might wish to have installed, to take full advantage of mod_perl functionality. Provided you have Andreas König's CPAN.pm module, simply run:

  cpan> install Bundle::Apache

This will fetch and install mod_perl and related packages for you all at once. Otherwise, once you've installed mod_perl see the listing by running

  % perldoc Bundle::Apache

See also the source and the binary distributions.