gtk+-1.2.9 compile problem

["N/A Nguyen" <cipher114 hotmail com>]

when i compile gtk+-1.2.9 i get an error when i tries to find X, then it 
tells me it can't find X library or include files.  i set the option to tell 
where it can find it, /usr/X11R6/lib for the libraries, and 
/usr/X11R6/include for the include files, but the /usr/X11R6/include 
directory just has bitmaps and pixmaps. i've come think that i need the X 
include files, but i don't know where to find them.  i've done searches but 
could not find them.  would appreciate any help to rememdy this problem
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