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diff --git a/include/lib/libc/arm_acle.h b/include/lib/libc/arm_acle.h
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+/*
+ * Copyright (c) 2021 ARM Limited
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * The definitions below are a subset of what we would normally get by using
+ * the compiler's version of arm_acle.h. We can't use that directly because
+ * we specify -nostdinc in the Makefiles.
+ *
+ * We just define the functions we need so far.
+ */
+
+#ifndef ARM_ACLE_H
+#define ARM_ACLE_H
+
+#if !defined(__aarch64__) || defined(__clang__)
+# define __crc32b __builtin_arm_crc32b
+# define __crc32w __builtin_arm_crc32w
+#else
+# define __crc32b __builtin_aarch64_crc32b
+# define __crc32w __builtin_aarch64_crc32w
+#endif
+
+#endif /* ARM_ACLE_H */