Every baseline installs herdr from source, which pins zig 0.16, and Arch now has 0.17, so their installs fail. Install them with herdr-bin (which provides herdr, and is what HEAD installs) in a commit on top, then put the clone back at the baseline itself, since update pulls --ff-only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>