[otrs] statistics (diagramm) under redhat 8.0

hi, i installed the redhat 8.0 rpm under redhat 8.0. when i run the stats (mkStats.pl) i got the following message: Can't locate GD.pm in @INC (@INC contains: /opt/otrs/Kernel/cpan-lib /opt/otrs /usr/lib/perl5/5.8.0/i386-linux-thread-multi /usr/lib/perl5/5.8.0 /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.0 /usr/lib/perl5/vendor_perl .) at ./mkStats.pl line 36. BEGIN failed--compilation aborted at ./mkStats.pl line 36. what can i do to get the stats running? thxxx for help. best regards, denis heitbrock