diff --git a/sys/sys/_stdarg.h b/sys/sys/_stdarg.h
--- a/sys/sys/_stdarg.h
+++ b/sys/sys/_stdarg.h
@@ -41,7 +41,6 @@
   typedef __va_list       va_list;
 #endif
 
-#ifdef __GNUCLIKE_BUILTIN_STDARG
   #define	va_start(ap, last)	__builtin_va_start((ap), (last))
   #define	va_arg(ap, type)	__builtin_va_arg((ap), type)
   #define	__va_copy(dest, src)	__builtin_va_copy((dest), (src))
@@ -49,6 +48,5 @@
     #define	va_copy(dest, src)	__va_copy(dest, src)
   #endif
   #define	va_end(ap)		__builtin_va_end(ap)
-#endif
 
 #endif /* ! _SYS__STDARG_H_ */
diff --git a/sys/sys/_types.h b/sys/sys/_types.h
--- a/sys/sys/_types.h
+++ b/sys/sys/_types.h
@@ -208,13 +208,8 @@
  * Types for varargs. These are all provided by builtin types these
  * days, so centralize their definition.
  */
-#ifdef __GNUCLIKE_BUILTIN_VARARGS
 typedef	__builtin_va_list	__va_list;	/* internally known to gcc */
-#else
-#error "No support for your compiler for stdargs"
-#endif
-#if defined(__GNUC_VA_LIST_COMPATIBILITY) && !defined(__GNUC_VA_LIST) \
-    && !defined(__NO_GNUC_VA_LIST)
+#if !defined(__GNUC_VA_LIST) && !defined(__NO_GNUC_VA_LIST)
 #define __GNUC_VA_LIST
 typedef __va_list		__gnuc_va_list;	/* compatibility w/GNU headers*/
 #endif