There should be a line in every slackbuild like this:
Code:
TMP=${TMP:-/tmp/SBo}
If I'm not mistaken, you can override the $TMP variable by something like this (depending on your shell):
Code:
# export TMP=/alternate/tmp/path
Then it should apply to all your slackbuild'ing until root logs out.
Or for each slackbuild:
Code:
# TMP=/alternate/tmp/path ./foo.Slackbuild