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A general description is here.
C++ standard specifications (‘CXX_STD =’ in ‘src/Makevars*’ and in the ‘SystemRequirements’ field of the ‘DESCRIPTION’ file) are now checked more thoroughly. Invalid values are still ignored but now give a warning, as do contradictory specifications.
‘tools/fetch-recommended’ can be used instead of ‘tools/rsync-recommended’ to fetch recommended packages into R sources using ‘curl’ on systems without ‘rsync’ or behind firewalls.