diff --git a/libc/include/ar.h b/libc/include/ar.h
new file mode 100644
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--- /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 <http://www.gnu.org/licenses/>.
+
+    ar.h
+    Header describing the `ar' archive file format.
+
+*******************************************************************************/
+
+#ifndef INCLUDE_AR_H
+#define INCLUDE_AR_H
+
+#include <sys/cdefs.h>
+
+__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   "!<arch>\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