Troubleshooting install issues

General

devtools version

The following error

WARNING: Rtools is required to build R packages, but no version of Rtools compatible with R 3.5.1 was found. (Only the following incompatible version(s) of Rtools were found:3.5)

Please download and install the appropriate version of Rtools from http://cran.r-project.org/bin/windows/Rtools/.

is due to a bug in an old version of devtools (issues/1772) which has since been fixed. Make sure that you have a recent version of devtools installed (2.2 is the most recent version).

Mac OS X

See these PowerPoint slides by Yuqing Liu for more detailed installation instructions with screenshots.