gdk-pixbuf library?

[cocoinfo <cocoinfo sina com>]

   I use gdk_pixbuf_new_from_file(),
         gdk_pixbuf_get_width()....in my application
  But when compiling it,linker report undefined referencing to 
those gdk-pixbuf funtions.Maybe because of the ld library is not right.

what library should be linked in?
where to find it?

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