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Since r53691, and issue 1600860, "." is added to library_dirs on Linux
and GNU systems. This probably should be extended to FreeBSD, and other
systems.
The critical point to notice is that the -L option is not only while
building Python itself, but also for extension modules (assuming Python
is installed into a non-standard location).
Now, the question is how to extend this approach to FreeBSD. For 2.5 and
2.6, I think it is safest to explicitly add freebsd to the list of
systems tested for.
For the trunk, and probably 3.0, I would try to add the library whenever
Py_ENABLE_SHARED is defined, and os.name is posix.