Код:

#include <stdlib.h>
#include <gtk/gtk.h>

int main(int argc, char *argv[])
{
  GtkBuilder *builder;
  GtkWidget *window;
  gtk_init(&argc,&argv);
  builder = gtk_builder_new();
  gtk_builder_add_from_file(builder,"window_main.glade",NULL);
  window = GTK_WIDGET(gtk_builder_get_object(builder,"window_main"));
  gtk_builder_connect_signals(builder,NULL);
  g_object_unref(builder);
  gtk_widget_show(window);
  gtk_main();
  return 0;
}

void on_window_main_destroy()
{
  gtk_main_quit();

}