Murashova

Thanks @andrjohns! Actually, the problem was fixed via an approach from your post from [here](https://discourse.mc-stan.org/t/modeling-failed-warnings-c-users-r-34-1-3-rtools40-usr-mingw-bin-g-not-found-errors-multiple-results-for-cxx14flags-found-something-is-wrong-false/19154/54?u=namurava). Thanks again for your help!