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A general description is here.
The version of LAPACK included in the sources has been updated to 3.8.0 (for the routines used by R, a very minor bug-fix change).
Legacy support of ‘make’ macros such as ‘CXX1X’ is formally deprecated: use the ‘CXX11’ forms instead.
‘Sys.timezone(location = FALSE)’ (which was a stop-gap measure for Windows long ago) is deprecated. It no longer returns the value of environment variable ‘TZ’ (usually a location).