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If a build fails, follow the "buildlog" links. They generally give useful errors. The #launchpad channel on irc.freenode.net is often helpful.
Manually building locally
- Download trunk:
svn checkout http://svn.apache.org/repos/asf/spamassassin/trunk
- In the trunk directory, create a pkgrules directory containing the rules from the latest sa-update, something like:
sa-update; mkdir packaging; cp /var/lib/spamassassin/3.003002/updates_spamassassin_org/* packaging/
- In the trunk directory, run the build command:
debuild -us -uc # This doesn't actually work.