Stan just broke after upgrade to R 4.0.2 under windows 10 required reinstallation - Help needed

[jonah]

Sorry you’re getting an error. Does this post help?

Rstan on Windows

As you all have noticed, there are a large number of people who are having problems with rstan 2.21.x on Windows. This thread is to try to bring those threads together. Eliminate all -march=native clauses from CXX14FLAGS in the ~/.R/Makevars.win or ~/.R/Makevars files, which you can do by calling file.edit("~/.R/Makevars.win") and file.edit("~/.R/Makevars"). Even though the startup message says to consider adding it to Sys.setenv(LOCAL_CPPFLAGS), do not do that. Note that the temporary URLs be…