--- Makefile.inc1.orig	2024-04-29 06:03:26.419417000 +0000
+++ Makefile.inc1	2024-04-29 06:04:17.026314000 +0000
@@ -2127,6 +2127,7 @@
 		/version/ {print $$2; next } ' \
 		${KSTAGEDIR}/${DISTDIR}/kernel.${INSTALLKERNEL}${flavor}.ucl ; \
 	${PKG_CMD} -o ABI=${PKG_ABI} -o ALLOW_BASE_SHLIBS=yes \
+		-o OSVERSION="${SRCRELDATE}" \
 		create -f ${PKG_FORMAT} \
 		-M ${KSTAGEDIR}/${DISTDIR}/kernel.${INSTALLKERNEL}${flavor}.ucl \
 		-p ${KSTAGEDIR}/${DISTDIR}/kernel.${INSTALLKERNEL}${flavor}.plist \
@@ -2163,6 +2164,7 @@
 		/version/ {print $$2; next } ' \
 		${KSTAGEDIR}/kernel.${_kernel}/kernel.${_kernel}${flavor}.ucl ; \
 	${PKG_CMD} -o ABI_FILE=${WSTAGEDIR}/usr/bin/uname -o ALLOW_BASE_SHLIBS=yes \
+		-o OSVERSION="${SRCRELDATE}" \
 		create -f ${PKG_FORMAT} \
 		-M ${KSTAGEDIR}/kernel.${_kernel}/kernel.${_kernel}${flavor}.ucl \
 		-p ${KSTAGEDIR}/kernel.${_kernel}/kernel.${_kernel}${flavor}.plist \