Cannot install stringi since Xcode Command Line Tools update

Question

• System: macOS Sierra 10.12.6
• Xcode: 9.2 (2347)
• R: 3.4.0
• RStudio: 1.1.383

Answer 1

Issue resolved by removing ~/.R/Makevars.

Exact steps taken:

1. Close all instances of RStudio
2. Run in Terminal: mv ~/.R/Makevars ~/.R/old_Makevars (note that the file has been renamed rather than deleted in case it may need to be restored)
3. Re-open RStudio.
4. Install stringi normally with install.packages("stringi")

This question might be useful to discover the contents/purpose of ~/.R/Makevars.