Building XFCE 4.4 RC - X Dependencies issue

[Lokesh Babu. M.]

Hello All,

I am trying build latest XFCE44RC on Fedora 6, I am getting this dependency
issues

checking for X... no
configure: error: X Window system libraries and header files are required
!! Failed to configure libxfce4mcs, see the errors above
!! for details on the problem.

A note at the XFCE web site says that xorg-x11-devel is prerequisite.
But I am not finding that in any of fedora repo's.

 please help me,

Regards,
Lokesh Babu. M.
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