2 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index a484d79f07..db6d7c4b74 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jun 23 14:27:33 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* common.mk (enc/unicode/casefold.h): update Unicode files in a
+	  sub-make, not to let the header depend on the files always.
+
 Wed Jun 22 22:02:26 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk (enc/unicode/casefold.h): add dependency and update by
diff --git a/common.mk b/common.mk
index f8afcc2d38..4009e5d88c 100644
--- a/common.mk
+++ b/common.mk
@@ -1074,6 +1074,7 @@ $(srcdir)/$(ALWAYS_UPDATE_UNICODE:yes=enc/unicode/casefold.h): \
 		$(UNICODE_SRC_DATA_DIR)/CaseFolding.txt
 
 $(srcdir)/enc/unicode/casefold.h: $(srcdir)/enc/unicode/case-folding.rb
+	$(Q) $(ALWAYS_UPDATE_UNICODE:yes=exit &&) $(MAKE) $(MFLAGS) Q=$(Q) update-unicode
 	$(Q) $(BASERUBY) $(srcdir)/enc/unicode/case-folding.rb \
 		--output-file=$@ \
 		--mapping-data-directory=$(UNICODE_SRC_DATA_DIR)