--- a/debian/patches/0003-reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/0003-reproducible-build.patch	2020-04-04 22:34:47.413571952 +0100
@@ -0,0 +1,46 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Last-Update: 2020-04-04
+
+--- netgen-lvs-1.5.133.orig/base/Makefile
++++ netgen-lvs-1.5.133/base/Makefile
+@@ -10,7 +10,11 @@ include ${NETGENDIR}/defs.mak
+ 
+ SRCS   += ${GR_SRCS}
+ DFLAGS += ${GR_DFLAGS}
++ifdef SOURCE_DATE_EPOCH
++DFLAGS += -DNETGEN_DATE="\"`date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u`\""
++else
+ DFLAGS += -DNETGEN_DATE="\"`date`\""
++endif
+ CFLAGS += ${GR_CFLAGS}
+ 
+ include ${NETGENDIR}/rules.mak
+--- netgen-lvs-1.5.133.orig/netgen/Makefile
++++ netgen-lvs-1.5.133/netgen/Makefile
+@@ -8,7 +8,11 @@ EXTRA_LIBS = ${NETGENDIR}/base/libbase.o
+ 	     ${MAIN_EXTRA_LIBS}
+ 
+ DFLAGS += ${GR_DFLAGS}
++ifdef SOURCE_DATE_EPOCH
++DFLAGS += -DNETGEN_DATE="\"`date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u`\""
++else
+ DFLAGS += -DNETGEN_DATE="\"`date`\""
++endif
+ 
+ LIBS += ${GR_LIBS} -lm
+ CFLAGS += ${GR_CFLAGS} -I${NETGENDIR}/base
+--- netgen-lvs-1.5.133.orig/tcltk/Makefile
++++ netgen-lvs-1.5.133/tcltk/Makefile
+@@ -6,7 +6,11 @@ include ${NETGENDIR}/defs.mak
+ 
+ EXTRA_LIBS = ${MAIN_EXTRA_LIBS}
+ 
++ifdef SOURCE_DATE_EPOCH
++DFLAGS += -DNETGEN_DATE="\"`date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u`\""
++else
+ DFLAGS += -DNETGEN_DATE="\"`date`\""
++endif
+ LIBS += -lm
+ CLEANS += netgen.sh netgen.tcl netgenexec${EXEEXT}
+ CFLAGS += -I${NETGENDIR}/base
--- a/debian/patches/series	2020-04-04 21:56:04.105175641 +0100
--- b/debian/patches/series	2020-04-04 22:34:45.461552797 +0100
@@ -1,2 +1,3 @@
 0002-Make-sure-hardening-flags-are-passed-down.patch
 0002-Fix-some-sprintf-calls.patch
+0003-reproducible-build.patch