--- a/debian/patches/reproducible_build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible_build.patch	2016-08-27 22:53:24.536392067 +0100
@@ -0,0 +1,27 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Last-Update: 2016-08-27
+
+--- cp2k-3.0.0.orig/makefiles/Makefile
++++ cp2k-3.0.0/makefiles/Makefile
+@@ -412,12 +412,20 @@ endif
+ 
+ # some practical variables for the build
+ ifeq ($(CPPSHELL),)
++ifdef SOURCE_DATE_EPOCH
++CPPSHELL := -D__COMPILE_ARCH="\"$(ARCH)\""\
++            -D__COMPILE_DATE="\"$(shell LC_ALL=C date --utc --date=@$${SOURCE_DATE_EPOCH})\""\
++            -D__COMPILE_HOST="\"generic\""\
++            -D__COMPILE_REVISION="\"$(strip $(REVISION))\""\
++            -D__DATA_DIR="\"$(DATA_DIR)\""
++else
+ CPPSHELL := -D__COMPILE_ARCH="\"$(ARCH)\""\
+             -D__COMPILE_DATE="\"$(shell date)\""\
+             -D__COMPILE_HOST="\"$(shell hostname)\""\
+             -D__COMPILE_REVISION="\"$(strip $(REVISION))\""\
+             -D__DATA_DIR="\"$(DATA_DIR)\""
+ endif
++endif
+ 
+ ifneq ($(CPP),)
+ # always add the SRCDIR to the include path (-I here might not be portable) 
--- a/debian/patches/series	2016-08-27 21:36:37.629174836 +0100
--- b/debian/patches/series	2016-08-27 22:53:22.348369738 +0100
@@ -1,3 +1,4 @@
 makeflags.patch
 testsuite_output.patch
 libxc3_support.patch
+reproducible_build.patch