To do this, you must have esd (The Enlightened Sound Daemon) installed. I recommend using fink's port. (fink install esd). After doing this, grab the OS X binary [48K download] I built using Frank Klemm's mppdec source. After unzipping, open up a Terminal and cd to the directory containing the unzipped mppdec and follow these instructions:
% chmod u+x mppdec (to change the file permissions to enable you to execute the binary)
% sudo mv mppdec /usr/local/bin/ (OPTIONAL: this allows you to run the command by simply typing 'mppdec' anywhere)
% mppdec FILENAME.mpc | esdcat and you will hear beautiful mpc audio. You can also use wildcards:
% mppdec *.mpc | esdcat
or even m3u playlists:
% mppdec playlist.m3u | esdcat
Also, type mppdec for more command line options.

