gtk installation problems configure: error: X development libraries not found

[arthy geraldin <arthy_l yahoo co in>]

Hello,
 
I'm new to gtk and this is the first time I'm installing it.I've installed all the dependencies for gtk.
When I'm trying to give a ./configure inside the gtk+-2.10.0 directory I get the following error.
 
checking return type of signal handlers... (cached) void
checking for x86 platform... yes
checking compiler support for MMX... yes
checking for X... no
configure: error: X development libraries not found

From the link http://developer.gnome.org/doc/API/2.0/gtk/gtk-building.html I found that  libraries from the X 
window system are needed to build  GTK+. 

But where to download these libraries from.??Does anyone know.??
 
However my system has already /usr/X11R6/lib/ directories and I've included this in the PKG_CONFIG_PATH and 
LD_LIBRARY_PATH. Still I get the above error while configuring.
 
Could anyone please tell me how to get rid of these errors or where to download these X window system 
libraries from.This is very urgent for me to fix so please reply asap.
 
Thanks in advance,
GA


                
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