Add guards against double inclusion.

Peter Eisentraut <peter_e@gmx.net>

Commit: b91f9042b045570e907811bd3eab00335f614bdf
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2002-10-21T18:53:20Z
Releases: 7.3.1
Add guards against double inclusion.

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