For testing Nintendo 64 homebrew ROMs, cen64 is the most accurate emulator (though it doesn’t run at full speed yet). Here’s how to build it from source on macOS:

1. Install XQuartz from the official distributed disk image
2. git clone https://github.com/n64dev/cen64.git
3. cd cen64
4. mkdir build
5. cd build
6. cmake ..
7. make
8. ./cen64 /path/to/pifdata.bin /path/to/rom.z64

You’ll have to obtain pifdata.bin yourself, as it’s a copyrighted binary file.)