macOS 12.7.6 can't install nix-info: _mkfifoat symbol not found

[reckenrode]

Also announced in the breaking changes topic.

Breaking changes announcement for unstable

As announced in the release notes for 25.05, the minimum supported version of macOS has been increases to 14.0. The default SDK is now 14.4. Older versions of the SDK have been moved to darwin-aliases.nix and are no longer available. Packages that used them have been updated to use the default SDK. Availability warnings are now errors by default when compiling with Clang on Darwin to ensure that packages do not unconditionally use newer APIs than the configured deployment target.