gtk_dial_new: how to compile?

[Luciano Ponte <l ponte pronet it>]

I need to use the gtk_dial_new function, but when I try to compile the 
application with  the following command:

gcc -O2 -Wall -g filename.c -o filename 'gtk-config --cflags'  
'gtk_config --libs'

obtain:
In function main:
                           undefined reference to ' gtk_dial_new'

I have the following include statements:
#include <gtk/gtk.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <gnome.h>
#include <asm/io.h>
#include <math.h>

What is wrong?


Thanks

Luciano