I'll asumme that you have installed mod_perl (from RPMs, compiling), koha is running in /usr/local/koha and you have apache 2.0.49 (I'm under SuSE 9.1). First in your mod_perl-startup.pl change *use lib qw( /usr/local/koha/intranet/modules ); *to: *use lib qw(/srv/www/perl-lib /usr/local/koha/intranet/modules );* Now go to your http configuration and find where you have the virtual servers. for each virtual server add something like this: *<Location /cgi-bin/koha/> # mod_perl mode SetHandler perl-script PerlResponseHandler ModPerl::Registry PerlOptions +ParseHeaders Options +ExecCGI </Location> * More or less this is my setup, this is not a howto, maybe someone can write something more detailed.