I just tried to install GD on a machine running Perl 5.00503, and the compiler barfed. Then I tried it on a machine running Perl 5.008 and the compiler barfed there too. I don't know how to fix this, but I can tell you what the issue most likely involves: C compiler flags. When you configure and compile perl, it makes a Config.pm file that contains the correct compiler options to use. On the former of my two above mentioned system, this file lives at the /usr/lib/perl5/5.00503/i386-linux/Config.pm location. If you do "perldoc -l Config" that will probably tell you where yours lives. You might have to tweak this. :-/