+#include <sys/cdefs.h>
+
+#ifdef __STDC__
+#include <stdarg.h>
+#else
+#include <varargs.h>
+#endif
+
+void err __P((int, const char *, ...));
+void verr __P((int, const char *, va_list));
+void errx __P((int, const char *, ...));
+void verrx __P((int, const char *, va_list));
+void warn __P((const char *, ...));
+void vwarn __P((const char *, va_list));
+void warnx __P((const char *, ...));
+void vwarnx __P((const char *, va_list));