see also http://www.ptitov.net/2008/07/request-tracker-installation-o.html Here are the steps how to install Request Tracker on CentOS 5 with PostgreSQL: Install RPM packages yum install postgresql postgresql-server postgresql-libsyum install httpd perl-BSD-Resource perl-FCGI perl-Apache-DBI mod_perlwget http://dag.wieers.com/rpm/packages/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpmrpm -Uhv rpmforge-release*.rpm yum install perl-Digest-HMAC perl-Apache-Session perl-Class-Container perl-Class-Data-Inheritable