D50246.diff
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	diff --git a/Makefile.inc1 b/Makefile.inc1
	--- a/Makefile.inc1
	+++ b/Makefile.inc1
	@@ -35,7 +35,10 @@
	# KERNEL_FLAGS= additional flags to pass to make(1) during buildkernel
	# SUBDIR_OVERRIDE="list of dirs" to build rather than everything.
	# All libraries and includes, and some build tools will still build.
	-
	+# REPRODUCIBLE_EPOCH="timestamp" to use instead of gmtime(3) for all
	+# timestamps in the build. This is used to facilitate reproducible
	+# build artifacts from the same source tree, with build tools like
	+# thermite.
	#
	# The intended user-driven targets are:
	# buildworld - rebuild everything, including glue to help do upgrades
	@@ -573,7 +576,7 @@

	_PKG_REVISION= ${_REVISION}
	_STRTIMENOW= %Y%m%d%H%M%S
	-_TIMENOW= ${_STRTIMENOW:gmtime}
	+_TIMENOW= ${_STRTIMENOW:gmtime=${REPRODUCIBLE_EPOCH:U0}}
	BRANCH_EXT=
	.if ${_BRANCH:MCURRENT} \|\| ${_BRANCH:MSTABLE} \|\| ${_BRANCH:MPRERELEASE*}
	_PKG_REVISION:= ${MAJOR_REVISION}
	@@ -602,7 +605,7 @@
	SOURCE_DATE_EPOCH!= ${GIT_CMD} -C ${SRCDIR} show -s --format=%ct HEAD
	.else
	TIMEEPOCHNOW= %s
	-SOURCE_DATE_EPOCH= ${TIMEEPOCHNOW:gmtime}
	+SOURCE_DATE_EPOCH= ${TIMEEPOCHNOW:gmtime=${REPRODUCIBLE_EPOCH:U0}}
	.endif
	.else
	SOURCE_DATE_EPOCH= ${PKG_TIMESTAMP}