|laziness, impatience, and hubris|
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GD is a little trickier to install than a Pure Perl module with no dependancies. First of all, GD depends on Math::Trig, so you would have to install that first. That is probably the smallest problem. The chances are that user 'nobody' or whatever user is used by the webserver, does not have privileges to use a c compiler. And then there is stuff like: $PREFIX = prompt('Where is libgd installed?','/usr/lib'); to catch.
So yes, pure perl modules can easilly be installed. Modules that require compilers are a little trickier. The easiest way for sure is to ask the admin to just install it for you.
All code is usually tested, but rarely trusted.
In reply to Re: Are there ways to resize pic without using CPAN modules