diff --git a/lib/compiler/armcc/errno.h b/lib/compiler/armcc/errno.h
index 43dab85d..d32d2414 100644
--- a/lib/compiler/armcc/errno.h
+++ b/lib/compiler/armcc/errno.h
@@ -4,6 +4,7 @@
  * Copyright (c) 1982, 1986, 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.
+ * Copyright 2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -19,37 +20,129 @@ extern "C" {
 
 #define LIBMETAL_ERR_BASE  100
 
+#ifndef EPERM
 #define	EPERM	(LIBMETAL_ERR_BASE + 1)  /* Operation not permitted */
+#endif
+
+#ifndef ENOENT
 #define	ENOENT	(LIBMETAL_ERR_BASE + 2)  /* No such file or directory */
+#endif
+
+#ifndef ESRCH
 #define	ESRCH	(LIBMETAL_ERR_BASE + 3)  /* No such process */
+#endif
+
+#ifndef EINTR
 #define	EINTR	(LIBMETAL_ERR_BASE + 4)  /* Interrupted system call */
+#endif
+
+#ifndef EIO
 #define	EIO	(LIBMETAL_ERR_BASE + 5)  /* Input/output error */
+#endif
+
+#ifndef ENXIO
 #define	ENXIO	(LIBMETAL_ERR_BASE + 6)  /* Device not configured */
+#endif
+
+#ifndef E2BIG
 #define	E2BIG	(LIBMETAL_ERR_BASE + 7)  /* Argument list too long */
+#endif
+
+#ifndef ENOEXEC
 #define	ENOEXEC	(LIBMETAL_ERR_BASE + 8)  /* Exec format error */
+#endif
+
+#ifndef EBADF
 #define	EBADF	(LIBMETAL_ERR_BASE + 9)  /* Bad file descriptor */
+#endif
+
+#ifndef ECHILD
 #define	ECHILD	(LIBMETAL_ERR_BASE + 10) /* No child processes */
+#endif
+
+#ifndef EDEADLK
 #define	EDEADLK	(LIBMETAL_ERR_BASE + 11) /* Resource deadlock avoided */
+#endif
+
+#ifndef EACCES
 #define	EACCES	(LIBMETAL_ERR_BASE + 13) /* Permission denied */
+#endif
+
+#ifndef EFAULT
 #define	EFAULT	(LIBMETAL_ERR_BASE + 14) /* Bad address */
+#endif
+
+#ifndef ENOTBLK
 #define	ENOTBLK	(LIBMETAL_ERR_BASE + 15) /* Block device required */
+#endif
+
+#ifndef EBUSY
 #define	EBUSY	(LIBMETAL_ERR_BASE + 16) /* Device busy */
+#endif
+
+#ifndef EEXIST
 #define	EEXIST	(LIBMETAL_ERR_BASE + 17) /* File exists */
+#endif
+
+#ifndef EXDEV
 #define	EXDEV	(LIBMETAL_ERR_BASE + 18) /* Cross-device link */
+#endif
+
+#ifndef ENODEV
 #define	ENODEV	(LIBMETAL_ERR_BASE + 19) /* Operation not supported by device */
+#endif
+
+#ifndef ENOTDIR
 #define	ENOTDIR	(LIBMETAL_ERR_BASE + 20) /* Not a directory */
+#endif
+
+#ifndef EISDIR
 #define	EISDIR	(LIBMETAL_ERR_BASE + 21) /* Is a directory */
+#endif
+
+#ifndef ENFILE
 #define	ENFILE	(LIBMETAL_ERR_BASE + 23) /* Too many open files in system */
+#endif
+
+#ifndef EMFILE
 #define	EMFILE	(LIBMETAL_ERR_BASE + 24) /* Too many open files */
+#endif
+
+#ifndef ENOTTY
 #define	ENOTTY	(LIBMETAL_ERR_BASE + 25) /* Inappropriate ioctl for device */
+#endif
+
+#ifndef ETXTBSY
 #define	ETXTBSY	(LIBMETAL_ERR_BASE + 26) /* Text file busy */
+#endif
+
+#ifndef EFBIG
 #define	EFBIG	(LIBMETAL_ERR_BASE + 27) /* File too large */
+#endif
+
+#ifndef ENOSPC
 #define	ENOSPC	(LIBMETAL_ERR_BASE + 28) /* No space left on device */
+#endif
+
+#ifndef ESPIPE
 #define	ESPIPE	(LIBMETAL_ERR_BASE + 29) /* Illegal seek */
+#endif
+
+#ifndef EROFS
 #define	EROFS	(LIBMETAL_ERR_BASE + 30) /* Read-only filesystem */
+#endif
+
+#ifndef EMLINK
 #define	EMLINK	(LIBMETAL_ERR_BASE + 31) /* Too many links */
+#endif
+
+#ifndef EPIPE
 #define	EPIPE	(LIBMETAL_ERR_BASE + 32) /* Broken pipe */
+#endif
+
+#ifndef EAGAIN
 #define	EAGAIN	(LIBMETAL_ERR_BASE + 35) /* Resource temporarily unavailable */
+#endif
 
 #ifdef __cplusplus
 }