Have you read the bit about patching gd-1.8.3 on solaris systems in the README? CPAN GD Readme

Try #2: have you adjusted this part of Makefile.pl? 
my @INC     = qw(-I/usr/local/include -I/usr/local/include/gd); 
my @LIBPATH = qw(-L/usr/lib/X11 -L/usr/X11R6/lib -L/usr/X11/lib -L/usr
+/local/lib );
my @LIBS    = qw(-lgd -lpng -lz);

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In reply to Re: Trouble with GD.pm and gd by lemming
in thread Trouble with GD.pm and gd by riot

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