[CentOS] Can't get the gd library to work

I have a system with FC2, with php and gd. I just installed the php 
package and the gd package and it works fine.
I also have a system with CentOS 4.1 and installed the php package and 
the gd package but when I use phpinfo() I do not see the gd extension.
Am I missing something?

I somehow feel it has something to do with the config flags

Working FC2:
'--with-gd' '--enable-gd-native-ttf'

Non-working CentOS 4.1:
'--with-gd=shared' '--enable-gd-native-ttf'

StarQuake
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