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

[=?ks_c_5601-1987?B?wbbH9rvz?= <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 ?