t/Polyline.t .. Can't locate loadable object for module GD in @INC (@INC contains: /home/mh/perl5/perlbrew/perls/perl-5.18.1/lib/site_perl/5.18.1/x86_64-linux-thread-multi /home/mh/perl5/perlbrew/perls/perl-5.18.1/lib/site_perl/5.18.1 /home/mh/perl5/perlbrew/perls/perl-5.18.1/lib/5.18.1/x86_64-linux-thread-multi /home/mh/perl5/perlbrew/perls/perl-5.18.1/lib/5.18.1 .) at GD/Polyline.pm line 45.