--- rs232.h.orig 2014-12-04 14:17:08.000000000 +0800 +++ rs232.h 2014-12-04 14:17:22.000000000 +0800 @@ -45,8 +45,7 @@ #include - -#ifdef __linux__ +#if defined(__linux__) || defined(__FreeBSD__) #include #include