diff --git a/src/os_unix.c b/src/os_unix.c
index cc026534d..80459c94e 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 184aee76d..c68250893 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,
 /**/