Try to do a following:

tar -vzxf GD-...tar.gz
cd ./GD-..
perl Makefile.PL PREFIX=/home/you/your_lib
make
make test
make install
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Library GD will be installed in the your home directory, where you have all privilege.

Using:

#!/usr/bin/perl -w

use lib qw(/home/your/your_lib/path_to_GD);
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SV* sv_bless(SV* sv, HV* stash);