Index: sys/conf/kern.opts.mk
===================================================================
--- sys/conf/kern.opts.mk
+++ sys/conf/kern.opts.mk
@@ -47,7 +47,8 @@
     EISA \
     EXTRA_TCP_STACKS \
     NAND \
-    OFED
+    OFED \
+    REPRODUCIBLE_BUILD
 
 # Some options are totally broken on some architectures. We disable
 # them. If you need to enable them on an experimental basis, you
Index: sys/conf/kern.post.mk
===================================================================
--- sys/conf/kern.post.mk
+++ sys/conf/kern.post.mk
@@ -357,8 +357,11 @@
 config.ln env.ln hints.ln vers.ln vnode_if.ln:
 	${NORMAL_LINT}
 
+.if ${MK_REPRODUCIBLE_BUILD} != "no"
+REPRO_FLAG="-r"
+.endif
 vers.c: $S/conf/newvers.sh $S/sys/param.h ${SYSTEM_DEP}
-	MAKE=${MAKE} sh $S/conf/newvers.sh ${KERN_IDENT}
+	MAKE=${MAKE} sh $S/conf/newvers.sh ${REPRO_FLAG} ${KERN_IDENT}
 
 vnode_if.c: $S/tools/vnode_if.awk $S/kern/vnode_if.src
 	${AWK} -f $S/tools/vnode_if.awk $S/kern/vnode_if.src -c
Index: tools/build/options/WITH_REPRODUCIBLE_BUILD
===================================================================
--- /dev/null
+++ tools/build/options/WITH_REPRODUCIBLE_BUILD
@@ -0,0 +1,3 @@
+$FreeBSD$
+Set to exclude build metadata (build time, user, host and path) in the kernel
+(kern.version sysctl and uname).