Index: configure
--- configure.orig	2018-03-15 11:11:16.000000000 +0100
+++ configure	2018-03-15 23:25:49.745268000 +0100
@@ -15991,6 +15991,7 @@
 /* end confdefs.h.  */
 
                         #define _XOPEN_SOURCE_EXTENDED 1
+                        #include <wchar.h>
                         #include <ncurses.h>
 
 int