cargo build error while compiling smithay

#[cfg(target_os = "linux")]
impl ClockSource for Boottime {
    fn id() -> libc::clockid_t {
        libc::CLOCK_BOOTTIME
    }
}

#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
impl ClockSource for Boottime {
    fn id() -> libc::clockid_t {
        libc::CLOCK_UPTIME
    }
}

#[cfg(target_os = "linux")]
impl ClockSource for Boottime {
    fn id() -> libc::clockid_t {
        libc::CLOCK_BOOTTIME
    }
}

#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
impl ClockSource for Boottime {
    fn id() -> libc::clockid_t {
        libc::CLOCK_UPTIME
    }
}