--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tool/ar.h	Wed Jun 03 07:40:00 2015 +0000
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *	@(#)ar.h	5.1 (Berkeley) 5/30/85
+ */
+
+#define	ARMAG	"!<arch>\n"
+#define	SARMAG	8
+
+#define	ARFMAG	"`\n"
+
+struct ar_hdr {
+	char	ar_name[16];
+	char	ar_date[12];
+	char	ar_uid[6];
+	char	ar_gid[6];
+	char	ar_mode[8];
+	char	ar_size[10];
+	char	ar_fmag[2];
+};