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#ifdef NIXecho -n "compiling ..."gcc `pkg-config --cflags --libs gtk+-2.0` scrolling.c -o scrollingif [ -a scrolling ] ; then	echo "Done."	./scrollingelse	echo "failed!."fi	exit#endif#include <string.h>#include <gtk/gtk.h>GdkWindow *gdk_window;gint x=50;PangoLayout *layout;GtkWidget *drawingarea1;gbooleanon_drawingarea1_expose_event           (GtkWidget       *widget,                                        GdkEventExpose  *event,                                        gpointer         user_data){	printf ("expose\n"); 	gdk_draw_layout (widget->window,  widget->style->black_gc, x,1, layout);  return FALSE;} void expose (void){  GdkRegion *region;	region = gdk_drawable_get_clip_region (gdk_window);	gdk_window_invalidate_region (gdk_window, region, TRUE);	gdk_window_process_updates (gdk_window, TRUE);	gdk_region_destroy (region);     }gboolean timer (gpointer data) {	x-=1;	expose();	return TRUE;}     intmain (int argc, char *argv[]) {  GtkWidget *window1;  gtk_init (&argc, &argv);   window1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);  drawingarea1 = gtk_drawing_area_new ();  gtk_widget_show (drawingarea1);  gtk_container_add (GTK_CONTAINER (window1), drawingarea1);	gtk_widget_realize (drawingarea1);	gdk_window=drawingarea1->window;  layout=gtk_widget_create_pango_layout (drawingarea1, "some scrolling text");   g_signal_connect ((gpointer) drawingarea1, "expose_event",                    G_CALLBACK (on_drawingarea1_expose_event),                    NULL);  gtk_widget_show (window1);  g_timeout_add (60, timer, NULL);   gtk_main();	return 0;}