diff -r 000000000000 -r 6474c204b198 xpcom/base/Makefile.in
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/base/Makefile.in	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+INSTALL_TARGETS += errorlist
+errorlist_FILES := \
+  ErrorListCDefines.h \
+  ErrorListCxxDefines.h \
+  $(NULL)
+errorlist_DEST = $(DIST)/include
+errorlist_TARGET := export
+
+include $(topsrcdir)/config/rules.mk
+
+ifdef MOZ_WIDGET_GTK
+CXXFLAGS        += $(TK_CFLAGS)
+endif
+
+# We generate ErrorListCxxDefines.h from ErrorList.h using regex.  The -n option
+# suppresses printing the pattern space, and the p at the end prints it anyway,
+# so we don't print lines that don't match the pattern to start with.
+ErrorListCxxDefines.h: ErrorList.h Makefile
+	echo '// IWYU pragma: private, include "nsError.h"' > $@
+	sed -n 's/.*ERROR(\([A-Z_0-9]*\).*/#define \1 nsresult::\1/p' < $< >> $@
+
+ErrorListCDefines.h: ErrorList.h Makefile
+		sed 's/.*ERROR(\([A-Z_0-9]*\),\( *\)\(.*\))[^)]*/#define \1 \2((nsresult)(\3))/' < $< > $@
+
+GARBAGE += \
+	ErrorListCxxDefines.h \
+	ErrorListCDefines.h \
+	$(NULL)