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macOS 27 will support pipe2 at runtime, and Xcode 27 (and Command Line Tools) support it at compile time. This means a macOS < 27 system will detect support for pipe2, but then binaries will crash at runtime, as pipe2 is not available. Just avoid pipe2 on macOS for now, and continue using pipe. Note that the compilation also produces availability warnings, and this will need to be backported.