Index: src/fast_library.cpp
--- src/fast_library.cpp.orig
+++ src/fast_library.cpp
@@ -29,6 +29,11 @@
 #include <sys/endian.h>
 #endif
 
+// For pthread_set_name_np
+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__)
+#include <pthread_np.h>
+#endif
+
 boost::regex regular_expression_cidr_pattern("^\\d+\\.\\d+\\.\\d+\\.\\d+\\/\\d+$");
 boost::regex regular_expression_host_pattern("^\\d+\\.\\d+\\.\\d+\\.\\d+$");
 
@@ -1246,12 +1251,16 @@ bool set_boost_process_name(boost::thread* thread, std
     char new_process_name[16];
     strcpy(new_process_name, process_name.c_str());
 
+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__OpenBSD__)
+    pthread_set_name_np(thread->native_handle(), new_process_name);
+#else
     int result = pthread_setname_np(thread->native_handle(), new_process_name);
 
     if (result != 0) {
         logger << log4cpp::Priority::ERROR << "pthread_setname_np failed with code: " << result;
         logger << log4cpp::Priority::ERROR << "Failed to set process name for " << process_name;
     }
+#endif
 
     return true;
 }