gtk.h cannot be found

["ssams" <ssams telkom net>]

Hi to you all from me, new gtk user.
I have compile gtk,atk,glib,pango. gtk-demo run 
succesfully, so testgtk. But when i try to compile simple 
hello.c system cannot found gtk/gtk.h. Are there anybody 
have a little freetime for me..?
regard 
ssams 
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