[PATCH 0/4] freebsd portability fixes

I've been setting up auto-builders for a few platforms to try to catch
portability problems early. Unfortunately, it was made harder by the
fact that the _current_ test scripts don't pass on all platforms.

With these patches, I can successfully run all test scripts from the
current 'master' on FreeBSD 6.1 (some of them probably affect OS X, too
-- I recall somebody complaining about the '! foo | bar' construct
recently).

-Peff