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A general description is here.
The deprecated support for PCRE versions 8.10 to 8.31 will be removed prior to R 3.4.0.
(Windows only) Function ‘setInternet2()’ is defunct.
‘configure’ looks for ‘__cospi’, ‘__sinpi’ and ‘__tanpi’ and uses these if ‘cospi’ _etc_ are not found. (OS X is the main instance.)