If you are using QEMU, SimH or any other emulator you need to connect to a console in the emulator. To connect to a console is using TELNET localhost PORT_NUMBER command, but MacOS (Darwin) does not has a telnet client.
Simply launch make utility on a terminal window:
$ make
p.s. TELNET has been tested on a: Darwin 17.7.0 Darwin Kernel Version 17.7.0 Sun Dec 1 19:19:56 PST 2019; root:xnu-4570.71.63~1/RELEASE_X86_64 x86_64