diff --git a/config/rules.mk b/config/rules.mk
index 13a4d430914..ca0d22f761e 100644
--- a/config/rules.mk
+++ b/config/rules.mk
@@ -2105,6 +2105,7 @@ showbuild:
 	@echo "DLL_SUFFIX         = $(DLL_SUFFIX)"
 	@echo "IMPORT_LIB_SUFFIX  = $(IMPORT_LIB_SUFFIX)"
 	@echo "INSTALL            = $(INSTALL)"
+	@echo "VPATH              = $(VPATH)"
 
 showhost:
 	@echo "HOST_CC            = $(HOST_CC)"
diff --git a/js/src/Makefile.in b/js/src/Makefile.in
index 13456c3ad46..fd11b3fa8f3 100644
--- a/js/src/Makefile.in
+++ b/js/src/Makefile.in
@@ -258,6 +258,19 @@ INSTALLED_HEADERS = \
 		prmjtime.h \
 		$(NULL)
 
+###############################################
+# BEGIN include sources for low-level code shared with Gecko
+#
+VPATH		+= \
+		$(srcdir)/../../mfbt \
+		$(NULL)
+
+EXPORTS_NAMESPACES = mozilla
+
+EXPORTS_mozilla = \
+		Util.h          \
+		$(NULL)
+
 ifdef ENABLE_TRACEJIT
 VPATH		+= \
 		$(srcdir)/tracejit \
diff --git a/js/src/config/rules.mk b/js/src/config/rules.mk
index 13a4d430914..ca0d22f761e 100644
--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -2105,6 +2105,7 @@ showbuild:
 	@echo "DLL_SUFFIX         = $(DLL_SUFFIX)"
 	@echo "IMPORT_LIB_SUFFIX  = $(IMPORT_LIB_SUFFIX)"
 	@echo "INSTALL            = $(INSTALL)"
+	@echo "VPATH              = $(VPATH)"
 
 showhost:
 	@echo "HOST_CC            = $(HOST_CC)"
diff --git a/mfbt/Util.h b/mfbt/Util.h
new file mode 100644
index 00000000000..98098961278
--- /dev/null
+++ b/mfbt/Util.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sw=4 et tw=99 ft=cpp:
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at:
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Code.
+ *
+ * The Initial Developer of the Original Code is
+ *   The Mozilla Foundation
+ * Portions created by the Initial Developer are Copyrigght (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef mozilla_Util_h_
+#define mozilla_Util_h_
+
+namespace mozilla {
+
+} // namespace mozilla
+
+#endif  // mozilla_Util_h_