Added support for syslog in FreeBSD

example/example.cpp

@@ -108,7 +108,7 @@ void async_example()
 //syslog example (linux/osx only)
 void syslog_example()
 {
-#if defined (__linux__) || defined(__APPLE__)
+#if defined (__linux__) || defined(__APPLE__)  || defined(__FreeBSD__)
     std::string ident = "spdlog-example";
     auto syslog_logger = spd::syslog_logger("syslog", ident, LOG_PID);
     syslog_logger->warn("This is warning that will end up in syslog. This is Linux only!");

include/spdlog/sinks/syslog_sink.h

@@ -5,7 +5,7 @@
 
 #pragma once
 
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__)
 
 #include <spdlog/sinks/sink.h>
 #include <spdlog/common.h>