programa Gtk não compila

Boa noite.
Meu programa Gtk dá erro quando tento compilá-lo.
É um exemplo do site da ufrj.
Segue o código:

#include <gtk/gtk.h>



void sair(GtkWidget *w, gpointer d);



int main(int argc, char* argv[]){

	GtkWidget *janela;



	gtk_init(&argc, &argv);



	janela = gtk_window_new(GTK_WINDOW_TOPLEVEL);



	gtk_window_set_title(GTK_WINDOW(janela), "Ola mundo!");



	gtk_signal_connect(GTK_OBJECT(janela), "destroy", GTK_SIGNAL_FUNC(sair), NULL);



	gtk_widget_show(janela);



	gtk_main();



	return 0;

}



void sair(GtkWidget *w, gpointer d){

	gtk_main_quit();

}

 

Mensagens de erro:
main.c: In function ‘main’:
main.c:14:2: warning: implicit declaration of function ‘gtk_signal_connect’ [-Wimplicit-function-declaration]
gtk_signal_connect(GTK_OBJECT(janela), "destroy", GTK_SIGNAL_FUNC(sair), NULL);
^
main.c:14:21: warning: implicit declaration of function ‘GTK_OBJECT’ [-Wimplicit-function-declaration]
gtk_signal_connect(GTK_OBJECT(janela), "destroy", GTK_SIGNAL_FUNC(sair), NULL);
^
main.c:14:52: warning: implicit declaration of function ‘GTK_SIGNAL_FUNC’ [-Wimplicit-function-declaration]
gtk_signal_connect(GTK_OBJECT(janela), "destroy", GTK_SIGNAL_FUNC(sair), NULL);
^
/tmp/ccOxemEz.o: na função `main':
main.c:(.text+0x60): referência indefinida para `GTK_SIGNAL_FUNC'
main.c:(.text+0x73): referência indefinida para `GTK_OBJECT'
main.c:(.text+0x8b): referência indefinida para `gtk_signal_connect'
collect2: error: ld returned 1 exit status

Estou usando o Gtk 3.