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A general description is here.
‘R CMD check’ now checks the packages used in ‘\donttest’ sections of
the examples. (These will be needed to run the examples
interactively.)
(Windows) The use of macro ‘ZLIB_LIBS’ in file ‘src/Makevars.win’ (which has not been documented for a long time) now requires an external ‘libz.a’ to be available (it is part of the ‘goodies’ used to compile Windows binary packages). It would be simpler to use ‘-lz’ instead.
‘R CMD check’ now checks the packages used in ‘\donttest’ sections of the examples are specified in the ‘DESCRIPTION’ file. (These are needed to run the examples interactively.)