Installation problem part 2

Ok, I have resolved some errors by manually copying perl modules around
(mainly coping HTML::Mason modules from /usr/lib/perl5/site_perl/5.6.1/HTML
to the RT/lib/ directory,) and by modifying the Perl @INC via apache config

When I got to load the webrt index page, I get a server 500 error in the
browser and the following entry in the httpd error log:

[Fri Aug 23 14:41:34 2002] [error] Undefined subroutine &RT::Mason::handler

Any ideas?