diff --git a/include/ar.h b/include/ar.h
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+++ b/include/ar.h
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+/****************************************************************************
+ * include/ar.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_AR_H
+#define __INCLUDE_AR_H
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* The layout of an archive (.a) file, as written by ar(1): the magic string
+ * ARMAG, then one struct ar_hdr per member, each followed by the member
+ * data padded to an even size.  All header fields are ASCII, padded with
+ * spaces.
+ */
+
+#define ARMAG   "!<arch>\n"   /* Magic string at the start of the file */
+#define SARMAG  8             /* Length of ARMAG */
+#define ARFMAG  "`\n"         /* Value of ar_fmag in every header */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct ar_hdr
+{
+  char ar_name[16];  /* Member name, terminated by '/' (GNU) or a space */
+  char ar_date[12];  /* Modification time, decimal seconds since the epoch */
+  char ar_uid[6];    /* Owner user ID, decimal */
+  char ar_gid[6];    /* Owner group ID, decimal */
+  char ar_mode[8];   /* File mode, octal */
+  char ar_size[10];  /* Size of the member data in bytes, decimal */
+  char ar_fmag[2];   /* Always ARFMAG */
+};
+
+#endif /* __INCLUDE_AR_H */