X Window System or development libraries not found

[VnPenguin]

Hi all,
I'm trying to build icewm 1.2.25 (from tarball) on my FC5t3 box. Just
run ./configure and I have an error about Xorg devel package:

...
checking for gettimeofday... yes
checking for putenv... yes
checking for select... yes
checking for socket... yes
checking for strtol... yes
checking for strtoul... yes
checking for basename... yes
checking for sysctlbyname... no
checking sys/select.h usability... yes
checking sys/select.h presence... yes
checking for sys/select.h... yes
checking sys/socket.h usability... yes
checking sys/socket.h presence... yes
checking for sys/socket.h... yes
checking types of arguments for select... int,fd_set *,struct timeval *
checking for getloadavg... yes
checking for kern.cp_time... no
checking for X... no
configure: error: X Window System or development libraries not found.
Make sure you have headers and libraries installed!

I installed xorg-x11-proto-devel.

I think that FC5 has changed something related to /usr/X11R6 & /usr
for all X header file/library,... but I don't how to fix it.

Any help will be appreciated.
Thanks,
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