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diff -up thunderbird-52.0/mail/installer/Makefile.in.fix-dupes thunderbird-52.0/mail/installer/Makefile.in
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--- thunderbird-52.0/mail/installer/Makefile.in.fix-dupes	2017-04-04 13:06:17.414621079 +0200
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+++ thunderbird-52.0/mail/installer/Makefile.in	2017-04-04 13:06:24.397611123 +0200
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@@ -15,6 +15,7 @@ ifndef SYSTEM_LIBXUL
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 MOZ_PKG_FATAL_WARNINGS = 1
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 endif
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 MOZ_PKG_DUPEFLAGS = \
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+	-w \
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 	-f $(srcdir)/allowed-dupes.mn \
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 	-f $(MOZILLA_DIR)/browser/installer/allowed-dupes.mn \
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 	$(NULL)