diff --git a/mozilla/config/mac/DefinesMozilla.h b/mozilla/config/mac/DefinesMozilla.h
index 6bd4025f08a..337d90e5506 100644
--- a/mozilla/config/mac/DefinesMozilla.h
+++ b/mozilla/config/mac/DefinesMozilla.h
@@ -23,6 +23,8 @@
 #ifndef DefinesMozilla_h_
 #define DefinesMozilla_h_
 
+#include "DefinesOptions.h"		// written at build time
+
 // *** Security
 //#define NADA_VERSION
 //#define EXPORT_VERSION
diff --git a/mozilla/config/mac/MANIFEST b/mozilla/config/mac/MANIFEST
index a5da0319f6e..0ff58d1f55c 100644
--- a/mozilla/config/mac/MANIFEST
+++ b/mozilla/config/mac/MANIFEST
@@ -4,6 +4,7 @@
 
 DefinesMac.h
 DefinesMozilla.h
+DefinesOptions.h
 
 JavaDefines.h