--- a/debian/patches/reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible-build.patch	2015-08-31 18:12:03.020475556 +0100
@@ -0,0 +1,14 @@
+--- ferret-vis-6.9.3.orig/fer/Makefile
++++ ferret-vis-6.9.3/fer/Makefile
+@@ -145,7 +145,11 @@ ferret:
+ .PHONY: update
+ update:
+ 	- mv $(EXECNAME) $(EXECNAME)_`ls -l $(EXECNAME) | awk '{print $$6"_"$$7}' | tr [A-Z] [a-z]`
++ifdef SOURCE_DATE_EPOCH
++	${MAKE} update_date DATE=`/bin/date --utc --date="@$(SOURCE_DATE_EPOCH)" +%D`
++else
+ 	${MAKE} update_date DATE=`/bin/date +%D`
++endif
+ 	rm -f special/xrevision_type_data.[Ffo]
+ 	sed -e 's&mmmmmmmm&($(DEBUG_TITLE)/$(GUI))&' -e 's&(/&(&' -e 's&/)&)&' < special/xrevision_type_data.template > special/xrevision_type_data.F 
+ 	rm -f special/xplatform_type_data.[Ffo]
--- a/debian/patches/series	2015-08-31 17:45:19.118960423 +0100
--- b/debian/patches/series	2015-08-31 18:11:59.896449040 +0100
@@ -4,3 +4,4 @@
 missing-functions.patch
 debian.patch
 fix-bashisms.patch
+reproducible-build.patch