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Commits04cad8f7and0c088568supported old macOS systems that didn't define O_CLOEXEC or O_DSYNC yet, but those arrived in macOS releases 10.7 and 10.6 (respectively), which themselves reached EOL around a decade ago. We've already made use of other POSIX features that early macOS vintages can't compile (for example commits623cc673,d2e15083). A later commit will use O_CLOEXEC on POSIX systems so it would be strange to pretend here that it's optional, and we might as well give O_DSYNC the same treatment since the reference is also guarded by a test for a macOS-specific macro, and we know that current Macs have it. Discussion: https://postgr.es/m/CA%2BhUKGKb6FsAdQWcRL35KJsftv%2B9zXqQbzwkfRf1i0J2e57%2BhQ%40mail.gmail.com