[Solved] fbprophet Install Error: command ‘x86_64-apple-darwin13.4.0-clang‘ failed with exit status 254

There are several different errors in the process of installing prophet. Record them

1) Error: ModuleNotFoundError: No module named ‘pystan’

Please install pystan before installing prophet

2) Error: command ‘x86_64-apple-darwin13.4.0-clang’ failed with exit status 254

To execute the following two sentences on the command line

export CC=gcc
export CXX=g++

3) Error: command ‘x86_64-apple-darwin13.4.0-clang’ failed with exit status 1

export CXX=clang

ProgrammerAH