[Zope] set TEMPDIR in 2.7-b4

i try ti import more data than available disk space at /tmp and get an IO-Error "Not enough disk space" when using 2.7-b2 i changed the environment variable TMPDIR in /instance_home/bin/zopectl, like export TMPDIR=/place/with/more/space but this is not working anymore when using 2.7-b4 did i made a mistake or did they changed the variable-name or whats going wrong thanx for help veiko