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mkfifo(1) on OpenBSD

The text c309759ec716, as OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1, OpenBSD 3.0, OpenBSD 2.9, OpenBSD 2.8, OpenBSD 2.7 shipped it.

make FIFOs

Flags it lists

mkfifo(1) on OpenBSD now