While setting up the very awesome NextGEN Gallery WorPress plugin.
I ran in to problems with the GD Library. The Gallery Overview page happily reported:
No GD Support!
Wow. Not very helpful.
I finally found the answer (at least for Red Hat Linux)
Run this command:
root@myhost:/ # yum install gd-devel php-gd
Note: You should, run this as a single command, not as 2 separate install commands.
root@myhost:/ # yum install gd-devel
root@myhost:/ # yum install php-gd
I'm not sure, but it didn't solve the issue until I ran the command correctly...