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A general description is here.
‘R CMD config’ now make use of personal ‘Makevars’ files under ‘~/.R’, in the same way as ‘R CMD SHLIB’ and ‘R CMD INSTALL’. This makes the utility more useful in package ‘configure’ scripts.
On Windows this may require the environment variable ‘HOME’ set.
The old behaviour can be obtained with the new option ‘--no-personal’.
‘citation(pkg)’ dropped the header and footer specified in the ‘CITATION’ file (PR#15257).