Index: head/include/stdlib.h
===================================================================
--- head/include/stdlib.h
+++ head/include/stdlib.h
@@ -315,7 +315,7 @@
 
 /* Deprecated interfaces, to be removed. */
 static inline void
-__attribute__((__deprecated__("sranddev to be removed in FreeBSD 13")))
+__deprecated("sranddev to be removed in FreeBSD 13")
 sranddev(void)
 {
 }
Index: head/sys/sys/cdefs.h
===================================================================
--- head/sys/sys/cdefs.h
+++ head/sys/sys/cdefs.h
@@ -468,6 +468,14 @@
 #define	__hidden
 #endif
 
+#if __GNUC__ > 4 || defined(__clang__)
+#define	__deprecated(m)	__attribute__((__deprecated__(m)))
+#elif defined(__GNUC__)
+#define	__deprecated(m)	__attribute__((__deprecated__))
+#else
+#define	__deprecated(m)
+#endif
+
 /*
  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  * require it.