- Ubuntu 14.04.5 LTS (on travis-ci), R 3.5.0 (release, devel) and R 3.4.4
- macOS 10.12.6 and 10.11.6 (on travis-ci), R 3.5.0 and R 3.4.4
- Windows Server 2012 R2 x64 (on appveyor), R 3.5.0 i386 and x64
There were no ERRORs or NOTEs. appyeyor shows a WARNING that package dependencies were built under R 3.5.1.