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A general description is here.
Command 'gnutar' is preferred to 'tar' when configure sets TAR. This is needed on Mac OS 10.6, where the default tar, bsdtar 2.6.2, has been reported to produce archives with illegal extensions to tar (according to the POSIX standard).
na.action() did not extract the 'na.action' component as documented.
tools::Rd2txt() did not render poorly written Rd files consistently with other renderers.