The code is written entirely in ANSI-C, so if you want to compile the source, you shouldn't have any problems with that. In the Documentation section you will find a list with commandline parameters. OCMJG doesn't plot the result on screen, but writes it to a 256 colors .pcx file (PC Paintbrush).
OCMJG is provided 'as is', without any warranties. Use at own risk.