Doesn't gtk_menu_ensure_uline_accel_group() work with pkg-config ?

[조현상 <hscho newer co kr>]

Hi. All.

I am developing program with menu acceleration. 
This is my code.

//*** code start

        GtkWidget *menu_bar, *file_item, *separator, *file_menu, *exit_item;
        GtkWidget *help_item, *help_menu, *what_item, *separator1, *about_item;
        GtkWidget *plot_item;
        
        GtkAccelGroup *file_accel_group;
        guint key;

        menu_bar        = gtk_menu_bar_new();
        
        file_menu       = gtk_menu_new();
          file_item     = gtk_menu_item_new_with_label("File");
              separator         = gtk_menu_item_new();
              exit_item         = gtk_menu_item_new_with_label("");

          help_menu     = gtk_menu_new();
            help_item   = gtk_menu_item_new_with_label("help");
              separator1        = gtk_menu_item_new();
              what_item         = gtk_menu_item_new_with_label("What's this ?");
              about_item        = gtk_menu_item_new_with_label("About my program");

          plot_item     = gtk_menu_item_new_with_label("Plot");
          
        file_accel_group = gtk_menu_ensure_uline_accel_group(GTK_MENU(file_menu));
        key = gtk_label_parse_uline(GTK_LABEL(GTK_BIN(exit_item)->child),"_Exit");
        gtk_widget_add_accelerator(exit_item, "activate", file_accel_group,key, GDK_CONTROL_MASK, 
GTK_ACCEL_VISIBLE);
          
//*** code end

I compiled my code according to tutorial for GTK+2.0, that is 

  cc `pkg-config --cflags --libs gtk+-2.0` hello.c -o hello

but, compiler generates error message

  undefined reference to ‘gtk_menu_ensure_uline_accel_group’

It operated well (no error and the result execute program works well) with 

  cc hello.c -o hello `gtk-config --cflags --libs` 

I want to use under-line menu acceleration with pkg-config. 
What can I do ?