build gdk on cairo-xcb

[Jianjun Yang - 杨建军 <Jianjun Yang palmsource com>]

hi, everybody

   I want to build gtk+ with xcb instead of xlib .so first I build cairo-1.0.2 using "--enable-xcb --disable-xlib" as the configure option. then i build pango-1.10.0 , finally i build gtk+-2.8.9 , but i met the following error:

In file included from gdkdrawable-x11.c:32:
/Helium/host/include/cairo/cairo-xlib.h:76:3: #error Cairo was not compiled with support for the xlib backend.

   i found that gdkdrawable-x11.c include cairo-xlib.h only. i think there should be any conditional compile in gdkdrawable-x11.c, just include cairo-xlib.h or cairo-xcb.h alternatively.
   gdkdrawable-x11.c only have these xlib functions :
     cairo_xlib_surface_set_size
     cairo_xlib_surface_create
     cairo_xlib_surface_create_for_bitmap
   
   it should also have these xcb functions:
     cairo_xcb_surface_set_size
     cairo_xcb_surface_create
     cairo_xcb_surface_create_for_bitmap   
   
  
   is there gdkdrawable-x11.c that use cairo-xcb yet ?

-jianjun