--- mstools/h/stdarg.h	2018/08/09 18:23:03	1.1.1.3
+++ mstools/h/stdarg.h	2018/08/09 18:25:24	1.1.1.4
@@ -59,7 +59,7 @@ typedef char *	va_list;
 
 #endif
 
-#if     defined (_ALPHA_)
+#if     defined(_ALPHA_)
 
 /*
  * The Alpha compiler supports two builtin functions that are used to
@@ -75,6 +75,8 @@ typedef char *	va_list;
 #ifdef _CFRONT
 extern __builtin_va_start(va_list, ...);
 #define __builtin_isfloat(a) __builtin_alignof(a)
+#elif defined(__cplusplus)
+extern __builtin_va_start(va_list, ...);
 #endif
 
 #define va_start(list, v) __builtin_va_start(list, v, 1)
@@ -88,7 +90,7 @@ extern __builtin_va_start(va_list, ...);
        ) \
     )
 
-#endif /* ALPHA */
+#endif /* _ALPHA_ */
 
 
 #ifdef __cplusplus