Index: sys/arch/amd64/include/ansi.h
===================================================================
RCS file: /cvsroot/src/sys/arch/amd64/include/ansi.h,v
retrieving revision 1.10
diff -u -r1.10 ansi.h
--- sys/arch/amd64/include/ansi.h	17 Jul 2011 20:54:36 -0000	1.10
+++ sys/arch/amd64/include/ansi.h	2 Feb 2019 03:27:04 -0000
@@ -58,7 +58,13 @@
 #define	_BSD_TIMER_T_		int		/* timer_t */
 #define	_BSD_SUSECONDS_T_	int		/* suseconds_t */
 #define	_BSD_USECONDS_T_	unsigned int	/* useconds_t */
+
+#if defined(__WCHAR_TYPE__)
+#define	_BSD_WCHAR_T_		__WCHAR_TYPE__	/* wchar_t */
+#else
 #define	_BSD_WCHAR_T_		int		/* wchar_t */
+#endif
+
 #define	_BSD_WINT_T_		int		/* wint_t */
 
 #else	/*	!__x86_64__	*/