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A general description is here.
‘aggregate(<data.frame>, drop=FALSE)’ no longer calls the function on <empty> parts but sets corresponding results to ‘NA’. (Thanks to Suharto Anggono's patches in PR#17280).
An alternative compiler for C++11 is now specified with ‘CXX11’, not ‘CXX1X’. Likewise C++11 flags are specified with ‘CXX11FLAGS’ and the standard (e.g., ‘-std=gnu++11’) is specified with ‘CXX11STD’.