diff --git a/src/os_unix.c b/src/os_unix.c
index cc026534d3f1f7900cfea7a24153915ab6ca82b3..80459c94eb6b0cc560665ced31f4a435df76a79b 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -804,6 +804,12 @@ mch_stackcheck(p)
  * completely full.
  */
 
+#if defined(HAVE_AVAILABILITYMACROS_H) \
+    && defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) \
+    && (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1090)
+# include <AvailabilityMacros.h>
+#endif
+
 #ifndef SIGSTKSZ
 # define SIGSTKSZ 8000    /* just a guess of how much stack is needed... */
 #endif
diff --git a/src/version.c b/src/version.c
index 184aee76d1620e94b088ef22b779286b2f795f25..c682508936c2ca891386065815d3baed960de325 100644
--- a/src/version.c
+++ b/src/version.c
@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    56,
 /**/
     55,
 /**/