pub const sf_hdtr = switch (native_os)
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pub const sf_hdtr = switch (native_os) { .freebsd, .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => extern struct { headers: ?[*]const iovec_const, hdr_cnt: c_int, trailers: ?[*]const iovec_const, trl_cnt: c_int, }, else => void, }