\item \R now supports files \file{Makevars.ucrt},
\file{Makefile.ucrt}, \file{configure.ucrt} and
\file{cleanup.ucrt} in packages, which are used in preference to
the \file{.win} variants. This allows keeping the \file{.win}
files around to support older versions of \R. This feature will
be removed in the future once support for older versions of \R
would no longer be needed.
Related to https://github.com/HenrikBengtsson/affxparser/pull/37#issuecomment-1076865362, it looks like one can be backward compatible with older versions of R, at least for now by using
Makevars.win
andMakevars.ucrt
;