Pulled latest version on OSX (v10.13.5) and get this. Just some missing DEFINEs or? serial_port.c:242:34: error: use of undeclared identifier 'B57600' case 57600: cfsetispeed (&ts, B57600); cfsetospeed (&ts, B57600); break; ^ serial_port.c:242:61: error: use of undeclared identifier 'B57600' case 57600: cfsetispeed (&ts, B57600); cfsetospeed (&ts, B57600); break; ^ serial_port.c:243:35: error: use of undeclared identifier 'B115200' case 115200: cfsetispeed (&ts, B115200); cfsetospeed (&ts, B115200); break; ^ serial_port.c:243:63: error: use of undeclared identifier 'B115200' case 115200: cfsetispeed (&ts, B115200); cfsetospeed (&ts, B115200); break; ^