rJava installation fails on macOS 10.14

Question

After upgrading to MacOS Mojave (10.14.1), I\'m no longer able to install rJava for R version 3.5.1 with Java version \"1.8.0_102\" installed.

I tried

Answer 1

Posting the solution I found in case it helps others -- I don't quite understand why this work or if it's the right way so looking for better alternatives!

This issue lead to this Apple forum where it's stated

For legacy software that looks for the macOS headers in the base system under /usr/include, please install the package file located at: /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14. pkg

To do this, open terminal and run these commands

cd /Library/Developer/CommandLineTools/Packages/
open macOS_SDK_headers_for_macOS_10.14.pkg

then follow prompts to install the package.

After this, in the terminal, configure rJava and install as in the previous answer

sudo R CMD javareconf

R -e "install.packages('rJava')"

and it should install without problem.