[GTK] Errore Compilazione

[64less]

Da qui http://library.gnome.org/devel/gtk-t...table/c39.html
Il codice è il seguente:

#include <gtk/gtk.h>

int main( int   argc,
          char *argv[] )
{
    GtkWidget *window;
    
    gtk_init (&argc, &argv);
    
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_widget_show  (window);
    
    gtk_main ();
    
    return 0;
}

L'errore che si presenta è questo:

gcc -Wall -g example.c -o example `pkg-config --cflags gtk+-2.0`
/tmp/ccjJaYKs.o: In function `main':
/home/User/example.c:7: undefined reference to `gtk_init'
/home/User/example.c:9: undefined reference to `gtk_window_new'
/home/User/example.c:10: undefined reference to `gtk_widget_show'
/home/User/example.c:12: undefined reference to `gtk_main'
collect2: ld returned 1 exit status