[lazarus] Linking problem

[AnglesA at aol.com]

The CVS now takes the methodpointers, however I am having a linking proble. 
Here is what I get when I "make" in /opt/fpc/lazarus
[...snip...]
Assembling main
Assembling lazarus
Linking ./lazarus
/usr/bin/ld: cannot open -lX11: No such file or directory
Warning: Error while linking
Closing script ./ppas.sh
1517 Lines compiled, 3.0 sec

do I need to install some devel rpm's?
I have gtk+-1.2.3-1 installed, is that OK?
TIA
-Angles