diff --git a/release/Makefile b/release/Makefile
index 67af96c697b5..4e89b4eb0ee9 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -396,12 +396,22 @@ rerelease release:
 .endif
 .if defined(TARGET_ARCH)
 	echo "export TARGET_ARCH=\"${TARGET_ARCH}\"" >> ${CHROOTDIR}/mk
+.endif
+.if defined(EXTRA_SRC)
+	echo "export EXTRA_SRC=\"${EXTRA_SRC}\""	>> ${CHROOTDIR}/mk
+.endif
+.if defined(FIXCRYPTO)
+	echo "export FIXCRYPTO=\"${FIXCRYPTO}\""	>> ${CHROOTDIR}/mk
+.endif
+.if defined(NOKERBEROS)
+	echo "export NOKERBEROS=\"${NOKERBEROS}\""	>> ${CHROOTDIR}/mk
+.endif
+.if defined(NO_SENDMAIL)
+	echo "export NO_SENDMAIL=\"${NO_SENDMAIL}\""	>> ${CHROOTDIR}/mk
 .endif
 	# Don't remove this, or the build will fall over!
 	echo "export RELEASEDIR=${_R}"		>> ${CHROOTDIR}/mk
 	echo "export PATH=/bin:/usr/bin:/sbin:/usr/sbin:${LOCALDIR}"	>> ${CHROOTDIR}/mk
-	echo "export TMPDIR=/tmp"		>> ${CHROOTDIR}/mk
-	echo "export MAKEOBJDIRPREFIX=/usr/obj"	>> ${CHROOTDIR}/mk
 	echo "export MANBUILDCAT=YES"		>> ${CHROOTDIR}/mk
 	echo "if [ ! -f /tmp/.world_done ]; then" >> ${CHROOTDIR}/mk
 	echo "	cd /usr/src"			>> ${CHROOTDIR}/mk