How to fix this compilation error?

[bgoodri]

Trouble installing rstan

You need to see a compiler that is more recent than the default g++-8. This can be obtained from the Red Hat Developer Toolset. You may also have to tell it what compiler to use for the C++14 standard. See

In addition, you likely need CXX14 = g++ -std=c++1y in your ~/.R/Makevars file.