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A general description is here.
Functions using the ‘TAR’ environment variable no longer quote the value when making ‘system’ calls. This allows values such as ‘tar --force-local’, but does require additional quotes in, e.g., ‘TAR = "'/path with spaces/mytar'"’.
R has always required a BLAS that conforms to IE60559 arithmetic, but after discovery of more real-world problems caused by a BLAS that did not, this is tested more thoroughly in this version.