C++14 standard requested but CXX14 is not defined

Modeling
9

Thank you!

Just in case the link breaks in the future, here’s the relevant section of code to be run from R after having installed Rtools but before installing rstan:

dotR <- file.path(Sys.getenv("HOME"), ".R")
if (!file.exists(dotR)) dir.create(dotR)
M <- file.path(dotR, "Makevars.win")
if (!file.exists(M)) file.create(M)
cat("\nCXX14FLAGS=-O3 -march=native",
    "CXX14 = g++ -m$(WIN) -std=c++1y",
    "CXX11FLAGS=-O3 -march=native",
    file = M, sep = "\n", append = TRUE)

In my particular case, I also had to edit this line

"CXX14 = g++ -m$(WIN) -std=c++1y"

and replace g++ with the full path C:/Rtools/mingw_64/g++.exe

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