Hi , this error message is returned because this function is not defined in the gtk 1.2.1 !! take a look at <http://developer.gnome.org/doc/API/gtk/gtkwindow.html>, GTK+ reference manual for 1.X series ... you will see that there is no 'gtk_window_get_focus', but another related fuctions :S If you port your app to GTK 2.X , try <http://developer.gnome.org/doc/API/2.0/gtk/GtkWindow.html> Best Regards > The compiler(gtk+1.2.10) gave the following error: > > [root@localhost test]# make > gcc `gtk-config --cflags` foc.c -o foc `gtk-config --libs` > foc.c: In function `fovu': > foc.c:60: warning: assignment makes pointer from integer without a cast > /tmp/ccbfegod.o(.text+0x297): In function `fovu': > : undefined reference to `gtk_window_get_focus' > collect2: ld returned 1 exit status > make: *** [foc] Error 1 -- Antonio Gomes E-mail: antonio.gomes@xxxxxxxxxxx Embedded Linux Lab - 10LE INdT - Instituto Nokia de Tecnologia (Manaus/Br) NOKIA's Technology Institute _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list