Update README.md

README.md

@@ -404,3 +404,7 @@ Below are some [benchmarks](https://github.com/gabime/spdlog/blob/v1.x/bench/ben
 
 ## Documentation
 Documentation can be found in the [wiki](https://github.com/gabime/spdlog/wiki/1.-QuickStart) pages.
+
+Thanks to [JetBrains](https://www.jetbrains.com/?from=spdlog) for donating licenses to their products to help developing **spdlog** <a href="https://www.jetbrains.com/?from=spdlog"><img src="logos/jetbrains-variant-4.svg" width="75" align="center" /></a>
+
+

include/spdlog/sinks/syslog_sink.h

@@ -5,6 +5,7 @@
 
 #include <spdlog/sinks/base_sink.h>
 #include <spdlog/details/null_mutex.h>
+#include <spdlog/details/synchronous_factory.h>
 
 #include <array>
 #include <string>
@@ -92,14 +93,14 @@ using syslog_sink_st = syslog_sink<details::null_mutex>;
 } // namespace sinks
 
 // Create and register a syslog logger
-template<typename Factory = default_factory>
+template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> syslog_logger_mt(const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0,
     int syslog_facility = LOG_USER, bool enable_formatting = false)
 {
     return Factory::template create<sinks::syslog_sink_mt>(logger_name, syslog_ident, syslog_option, syslog_facility, enable_formatting);
 }
 
-template<typename Factory = default_factory>
+template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> syslog_logger_st(const std::string &logger_name, const std::string &syslog_ident = "", int syslog_option = 0,
     int syslog_facility = LOG_USER, bool enable_formatting = false)
 {