Problem with cmdstan unpacking

I believe this might be due to some makeflags missing when working with RTools42, can you try running this:

cpp_options <- list(
  "CXXFLAGS += -Wno-nonnull",
  "TBB_CXXFLAGS= -U__MSVCRT_VERSION__ -D__MSVCRT_VERSION__=0x0E00"
)

cmdstanr::cmdstan_make_local(cpp_options = cpp_options)
cmdstanr::rebuild_cmdstan()
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