Mac OS run failed

[KillWilde]

megatron@localhost PerfectTemplate % swift run
Building for debugging...
/Users/megatron/Documents/Web/PerfectTemplate/.build/checkouts/PerfectLib/Sources/PerfectLib/Log.swift:73:28: error: cannot convert value of type 'CVaListPointer' to expected argument type '__darwin_va_list?' (aka 'Optional<UnsafeMutablePointer>')
vsyslog(priority, "%s", $0)
^
[2/3] Compiling PerfectLib Log.swift