diff --git a/libc/include/ar.h b/libc/include/ar.h
new file mode 100644
index 00000000..9823b3b7
--- /dev/null
+++ b/libc/include/ar.h
@@ -0,0 +1,58 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+ This file is part of the Sortix C Library.
+
+ The Sortix C Library is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+
+ The Sortix C Library is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with the Sortix C Library. If not, see .
+
+ ar.h
+ Header describing the `ar' archive file format.
+
+*******************************************************************************/
+
+#ifndef INCLUDE_AR_H
+#define INCLUDE_AR_H
+
+#include
+
+__BEGIN_DECLS
+
+/* Archive files start with the ARMAG identifying string. Then follows a
+ `struct ar_hdr', and as many bytes of member file data as its `ar_size'
+ member indicates, for each member file. */
+
+/* String that begins an archive file. */
+#define ARMAG "!\n"
+
+/* Size of that string. */
+#define SARMAG 8
+
+/* String in ar_fmag at end of each header. */
+#define ARFMAG "`\n"
+
+struct ar_hdr
+{
+ char ar_name[16]; /* Member file name, sometimes / terminated. */
+ char ar_date[12]; /* File date, decimal seconds since Epoch. */
+ char ar_uid[6]; /* User ID in ASCII decimal. */
+ char ar_gid[6]; /* Group ID in ASCII decimal. */
+ char ar_mode[8]; /* File mode, in ASCII octal. */
+ char ar_size[10]; /* File size, in ASCII decimal. */
+ char ar_fmag[2]; /* Always contains ARFMAG. */
+};
+
+__END_DECLS
+
+#endif