Just in case some of you use homebrew to install/update SWI-Prolog on Mac OS. I created a tap that also supports --devel flag (recently removed from the official homebrew core). The latest versions are already there (8.0.1 and 8.1.1), and I keep them updated. Let’s see how the community develops the official formula in the long run, but in the meanwhile it’s an ok workaround.
brew tap likelion/tap brew install swipl brew install swipl --devel