Simples programinha em GTK que mostra uma janela com um botão falando "Olá mundo!" que, quando pressionado, destrói a janela.

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/* Ola mundo em GTK */
/* Compile assim: gcc gtk_t.c -o gtk_t `pkg-config --cflags --libs gtk+-2.0` */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gtk/gtk.h>

static gboolean delete_event(GtkWidget *widget, GdkEvent *event, gpointer data);
static void destroy(GtkWidget *widget, gpointer data);

int main(int argc, char *argv[])
{
   GtkWidget *window;
   GtkWidget *button;
   
   gtk_init(&argc, &argv);
   window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(delete_event), NULL);
   g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
   gtk_container_set_border_width(GTK_CONTAINER(window), 10);
   button = gtk_button_new_with_label("Ola mundo!");
   g_signal_connect_swapped(G_OBJECT(button), "clicked", G_CALLBACK(gtk_widget_destroy), G_OBJECT(window));
   gtk_container_add(GTK_CONTAINER(window), button);
   gtk_widget_show(button);
   gtk_widget_show(window);
   gtk_main();
   
   return(0);
}

static gboolean delete_event(GtkWidget *widget, GdkEvent *event, gpointer data)
{
   g_print("delet event ocurred!");
   return TRUE;
}

static void destroy(GtkWidget *widget, gpointer data)
{
   gtk_main_quit();
}

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