RStan Troubleshooting

This is a list of common problems and their solutions.

Problem: Stan used to run on my computer but it suddenly stopped running.

• Possible solution: Your computer may have updated Xcode. You may need to launch Xcode once to accept its license. This can be done in the Terminal window by typing "sudo xcodebuild - license" and following the instructions from there.

Problem: Errors regarding xcodebuild or xcode

• Possible solutions: Install xcode via app-store, or do xcode-select --install in the R console

Problem: Rtools is not working

• Possible solution: Make sure you have the right Rtools, (32 or 64bit) for your system.

Problem: I can't install Rtoolchain

• Possible solution: If on macOS, find the .pkg in /Library/Developer/CommandLineTools/Packages/ and double-clicking on that to install the C++ headers to /usr/include, then in file.edit("~/.R/Makevars")delete the part of CXX14FLAGS where it says -isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include.

Problem: Makevars does not exist or other Makevars problems.

• Possible solution: try file.remove("~/.R/Makevars.win") and then install stan headers and rstan binary, e.g. on windows: install.packages("https://win-builder.r-project.org/9lJAt18Tb6mf/StanHeaders_2.18.1-10.zip", repos = NULL) and install.packages("https://win-builder.r-project.org/tJ1528Lvo0H3/rstan_2.18.2.zip", repos = NULL).