gtkのインストール

~$ su;パスワードを入力し管理者権限になる
# aptitude install libgtk2.0-dev

ウインドウにhelloworldを表示させる

-----------gtkhelloworld.c-------------


#include <gtk/gtk.h>

gboolean
cb_expose_event (GtkWidget       *widget,
		 GdkEventExpose  *event,
		 gpointer        user_data) 
{
  GdkWindow *drawable = widget->window;
  cairo_t   *cr;

  cr = gdk_cairo_create (drawable);

  cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
  cairo_select_font_face (cr, "FreeSans",
			  CAIRO_FONT_SLANT_ITALIC, CAIRO_FONT_WEIGHT_NORMAL);
  cairo_set_font_size (cr, 40.0);
  cairo_move_to (cr, 50.0, 50.0);
  cairo_show_text (cr, "Hello,World"); 

  cairo_destroy (cr);

  return FALSE;
}

int 
main (int argc, char *argv[]) 
{
  GtkWidget *window;
  GtkWidget *canvas;

  gtk_init (&argc, &argv);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW(window), "Hello World");  
  gtk_widget_set_size_request (window, 400, 200);
  g_signal_connect (G_OBJECT(window), "destroy",
		    G_CALLBACK(gtk_main_quit), NULL);

  canvas = gtk_drawing_area_new ();
  gtk_container_add (GTK_CONTAINER(window), canvas);
  g_signal_connect (G_OBJECT(canvas), "expose_event",
                    G_CALLBACK (cb_expose_event), NULL);

  gtk_widget_show_all (window);
  gtk_main ();

  return 0;
}

---------------------------------------

gtkhelloworld.cのダウンロード

（cdコマンドでgtkhelloworld.cの置いてあるディレクトリに移動しておく）
~$ gcc gtkhelloworld.c -o gtkhelloworld `pkg-config --cflags --libs gtk+-2.0`

~$ ./gtkhelloworld