Apache::VMonitor 2.x works with both mod_perl (Apache 1.x) and mod_perl2 (Apache 2.x).
To build:
% perl Makefile.PL
% make
% make test
% make install
It should auto-detect which version you have and where your httpd is installed. If
this does not work, you need to specify the location of your apache binary as
follows:
% perl Makefile.PL -httpd <path to httpd>
If you have both installed you need to decide which version of mod_perl to build
it for.