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Not sure why you would prefer an unstable, unreleased hg trunk version to a stable, released one.
And as you've seen, Python 2 and Python 3 are quite different things.
As for dl failing on build, you've already stated that it does *not* build, together with bsddb185 and gdbm (for which the library headers are missing). setup.py does exactly that test for 64-bit platforms. Then you activate it explicitly, and complain that it does build...
And lastly, all these things are *not* a build failure of Python: missing modules just means that, well, these modules won't be there. And failing tests just means that there *may* be a problem when using the respective module -- but for platform-dependent modules it could just as well mean that your system is configured in a special way.