#20 0.39 cannot detect gdk-pixbuf

As supplied by my vendor (OpsnSUSE 10.2), gdk-pixbuf has no metadata file for pkg-config, so the configure test fails, but it has a config info program in /opt/gnome/bin/gdk-pixbuf-config. This has to be run with the arguments --libs and --cflags in turn to extract the desired info.