casa-mp-base

--- ./lib/system/certs.c.old    2017-04-14 10:36:27.000000000 -0700

+++ ./lib/system/certs.c    2017-04-14 10:37:10.000000000 -0700

@@ -47,8 +47,15 @@

 #ifdef __APPLE__

 # include <CoreFoundation/CoreFoundation.h>

 # include <Security/Security.h>

+#ifndef __MAC_OS_X_VERSION_MIN_REQUIRED

+#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050

 # include <Availability.h>

+#else

+# include <AvailabilityMacros.h>

+#endif

 #endif

+#endif

+

 /* System specific function wrappers for certificate stores.

  */