macOS Sequoia breaks existing Lix installations
macOS 15 "Sequoia" changed the user ID ranges used by the system, such that some of the IDs for existing Nix build users got used by some new system features instead.
The symptom of this problem is that Nix builds will fail out with the following error, since the previous user ID used by _nixbld1 got clobbered by Apple's updater:
error: the user '_nixbld1' in the group 'nixbld' does not exist
To fix this on your system, run the latest Lix installer (any version of the Lix installer ≥ 2.91.0-1) with the repair sequoia option:
curl -sSf -L https://install.lix.systems/lix | sh -s -- repair sequoia
You may run this before or after updating to Sequoia (to run it before the upgrade, add --move-existing-users to the end of the command); it just migrates the user IDs used by Lix to a range recommended by Apple.
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