protect against multiple inclusion

include/_tail_cc/varargs.h

@@ -4,9 +4,13 @@
  */
 /* $Header$ */
 
+#ifndef _VARARGS_H
+#define _VARARGS_H
+
 typedef char *va_list;
 # define __va_sz(mode)	(((sizeof(mode) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))
 # define va_dcl int va_alist;
 # define va_start(list) (list = (char *) &va_alist)
 # define va_end(list)
 # define va_arg(list,mode) (*((mode *)((list += __va_sz(mode)) - __va_sz(mode))))
+#endif /* _VARARGS_H */