--- include/crypto/rand.h.orig
+++ include/crypto/rand.h
@@ -21,7 +21,7 @@
 # include <openssl/rand.h>
 
 # if defined(__APPLE__) && !defined(OPENSSL_NO_APPLE_CRYPTO_RANDOM)
-#  include <Availability.h>
+#  include <AvailabilityMacros.h>
 #  if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200) || \
      (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000)
 #   define OPENSSL_APPLE_CRYPTO_RANDOM 1