Index: release/scripts/mm-mtree.sh
===================================================================
--- release/scripts/mm-mtree.sh
+++ release/scripts/mm-mtree.sh
@@ -30,7 +30,15 @@

 # Set the default path for the temporary root environment
 #
-TEMPROOT='/var/tmp/temproot'
+#  Save the old TMPDIR variable
+__TMPDIR="${TMPDIR}"
+export TMPDIR="/var/tmp"
+# Generate a uniq temproot dir to work around parallel release
+# failure without chroot.
+TEMPROOT=`mktemp -d -t 'temproot'`
+#  Restore the old TMPDIR
+export TMPDIR="${__TMPDIR}"
+unset __TMPDIR

 # Assign the location of the mtree database
 #