R CMD check found WARNINGs

Process completed with exit code 1.

No such keg: /opt/homebrew/Cellar/r

Found the following file(s) containing GNU extensions:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config