--- a/jdk/make/common/Defs.gmk	Wed Jul 05 16:39:00 2017 +0200
+++ b/jdk/make/common/Defs.gmk	Wed Jul 16 09:51:43 2008 -0700
@@ -703,7 +703,7 @@
 ifdef ALT_COPYRIGHT_YEAR
   COPYRIGHT_YEAR = $(ALT_COPYRIGHT_YEAR)
 else
-  COPYRIGHT_YEAR = $(shell $(DATE) '+%Y')
+  COPYRIGHT_YEAR := $(shell $(DATE) '+%Y')
 endif
 
 # Install of imported file (JDK_IMPORT_PATH, or some other external location)