Index: release/Makefile
===================================================================
--- release/Makefile
+++ release/Makefile
@@ -21,6 +21,7 @@
 #            (by default, the directory above this one)
 #  PORTSDIR: location of ports tree to distribute (default: /usr/ports)
 #  DOCDIR:   location of doc tree (default: /usr/doc)
+#  XTRADIR: xtra-bits-dir argument for <arch>/mkisoimages.sh
 #  NOPKG:    if set, do not distribute third-party packages
 #  NOPORTS:  if set, do not distribute ports tree
 #  NOSRC:    if set, do not distribute source tree
@@ -242,13 +243,13 @@
 
 release.iso: disc1.iso
 disc1.iso: disc1
-	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_CD ${.TARGET} disc1
+	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_CD ${.TARGET} disc1 ${XTRADIR}
 
 dvd1.iso: dvd pkg-stage
-	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_DVD ${.TARGET} dvd
+	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_DVD ${.TARGET} dvd ${XTRADIR}
 
 bootonly.iso: bootonly
-	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_BO ${.TARGET} bootonly
+	sh ${.CURDIR}/${TARGET}/mkisoimages.sh -b ${VOLUME_LABEL}_BO ${.TARGET} bootonly ${XTRADIR}
 
 memstick: memstick.img
 memstick.img: disc1