- install macports, follow this guide
In terminal run the command: sudo port install mscgen NOTE: make sure you have Unix tools installed from Xcode and the X11 installed or you may get the following error
“Computing dependencies for mscgenError: Unable to execute port: can’t read “build.cmd”: Failed to locate ‘make’ in path: ‘/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin’ or at its MacPorts configuration time location, did you move it?”
Et voilà, you should now be installing mscgen, this will take a while so sit back and relax!
You can use this same process to get many of the other ports from macports!