--- a/make/autoconf/flags.m4	Wed Apr 04 14:42:53 2018 -0700
+++ b/make/autoconf/flags.m4	Wed Apr 04 16:13:30 2018 -0700
@@ -116,7 +116,7 @@
     # of the OS. It currently has a hard coded value. Setting this also limits
     # exposure to API changes in header files. Bumping this is likely to
     # require code changes to build.
-    MACOSX_VERSION_MIN=10.7.0
+    MACOSX_VERSION_MIN=10.9.0
     MACOSX_VERSION_MIN_NODOTS=${MACOSX_VERSION_MIN//\./}
 
     AC_SUBST(MACOSX_VERSION_MIN)