Use 'mktemp' in a portable way: on OS X, mktemp requires a template argument, but if we give a template, linux requires providing a path. So specify a template, and use ${TMPDIR:-/tmp} as this path (i.e. use TMPDIR if it is set, and /tmp otherwise).
Use 'mktemp' in a portable way: on OS X, mktemp requires a template argument,
but if we give a template, linux requires providing a path. So specify a
template, and use ${TMPDIR:-/tmp} as this path (i.e. use TMPDIR if it is set,
and /tmp otherwise).


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@23321 0785d39b-7218-0410-832d-ea1e28bc413d

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