diff --git a/src/configure.in b/src/configure.in
index 11e1d63..73470fc 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -206,6 +206,10 @@
     dnl TODO: use -arch i386 on Intel machines
     CPPFLAGS="$CPPFLAGS -DMACOS_X_UNIX -no-cpp-precomp"
 
+    dnl Mac OS X 10.9+ no longer include AvailabilityMacros.h in Carbon
+    dnl so we need to include it to have access to version macros.
+    AC_CHECK_HEADER(AvailabilityMacros.h, [AC_DEFINE(HAVE_AVAILABILITYMACROS_H, 1, [ Define if we have AvailabilityMacros.h on Mac OS X ])])
+
     dnl If Carbon is found, assume we don't want X11
     dnl unless it was specifically asked for (--with-x)
     dnl or Motif, Athena or GTK GUI is used.