sachin: help in compiling gdk program

["Sachin Dharmapurikar" <anothersachin rediffmail com>]

Dear friends,
       I am beginner of the gtk+ programming. I want to compile a 
simple gdk program which can plot the given points in a window. I 
don't when I compile the program start.c with following command 
line,

gcc -Walls start.c -o start `gtk-config --cflags --libs`

the program compiles without warning but

(GdkWindow *) window = gdk_window_new( window, attr, 0xb100);

this statement stores NULL in windows!
Can you help me?

thanks a lot.
                    Sachin