--- extconf.rb	2014-07-05 12:43:39.000000000 +0200
+++ /root/extconf.rb	2019-01-18 10:52:49.536110354 +0100
@@ -153,11 +153,13 @@
 
 puts "checking for the menu library..."
 if have_header("menu.h") or have_header("ncursesw/menu.h")
-  have_library("menu", "new_menu")
+  have_library("menuw", "new_menu")
 else
   raise "menu library not found."
 end
 
+have_func("set_menu_win")
+
 puts "checking for various ruby and standard functions.."
 if have_func("rb_thread_fd_select")
   $CFLAGS  += " -DHAVE_RB_THREAD_FD_SELECT"