Just upload a short script to generate a page with the info you need something like this

#! perl -w
use CGI ':standard';
use GD;
print header, html( h1( "CGI: $CGI::VERSION GD: $GD::VERSION" ) );
[download]

Then navigate to that script using your browser and you'll see something like

CGI: 2.752 GD: 1.27