diff --git a/include/lib/libc/cdefs.h b/include/lib/libc/cdefs.h
index b11d072..97b7824 100644
--- a/include/lib/libc/cdefs.h
+++ b/include/lib/libc/cdefs.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2022, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2025, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -36,4 +36,7 @@
 #define __STRING(x)	#x
 #define __XSTRING(x)	__STRING(x)
 
+#define __predict_true(exp)     (exp)
+#define __predict_false(exp)    (exp)
+
 #endif /* CDEFS_H */
diff --git a/include/lib/libc/stdlib.h b/include/lib/libc/stdlib.h
index 4e5a824..cf30ef3 100644
--- a/include/lib/libc/stdlib.h
+++ b/include/lib/libc/stdlib.h
@@ -29,4 +29,6 @@
 unsigned long strtoul(const char *nptr, char **endptr, int base);
 long long strtoll(const char *nptr, char **endptr, int base);
 unsigned long long strtoull(const char *nptr, char **endptr, int base);
+void qsort(void *, size_t, size_t,
+           int (* _Nonnull)(const void *, const void *));
 #endif /* STDLIB_H */