[Rd] How do I set a compile flag _WIN32_WINNT=0x600 in Makevars.Win

[Witold E Wolski]

Sorry for bothering you

I am trying to build the R grpc package on windows:
https://github.com/nfultz/grpc

against an MSYS2 build of grpc.

when running devtools::install() I am getting the following error:

C:/msys64/mingw64/include/grpc/impl/codegen/port_platform.h:47:2:
error: #error "Please compile grpc with _WIN32_WINNT of at least 0x600
(aka Windows Vista)"
 #error \
  ^

Which, if I am correct asks me to set _WIN32_WINNT=0x600

My Makevars.Win looks as follows:

PKG_CPPFLAGS=-IC:/msys64/mingw64/include
PKG_LIBS=-LC:/msys64/mingw64/lib -lgrpc

What should I do?

Have a great day
best regards
Witek



-- 
Witold Eryk Wolski