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The ‘make’ macro ‘AWK’ which is long unused by R itself but recorded in file ‘etc/Makeconf’ is deprecated and will be removed in R 3.3.0.
The C header file ‘S.h’ is no longer documented: its use should be replaced by ‘R.h’.
‘withCallingHandler()’ now (again) handles warnings even during S4 generic's argument evaluation. (PR#16111)