How to enable graph for reporit

[tung2000]

i setting reports have a enable graph
and in the report,have a graph icon,but when i kick this icon,it say "GD library not available

Reportit 0.7.5a
Fredora 16
Cacti Version: 0.8.7i, Plugin Architecture Version: 3.1

Thanks!

[gandalf]

Please install php-gd (or whatever the package is called on your distro)
R.