Also note that make and system headers are not included in this package so you will also need to install XCode3 (10.6), which is available for free with a registration, or a later version of XCode (which is available for free from the App store). Note that there is no uninstaller (see MacPorts guide for some hints on what is safe to remove).
You can use the binary release (only x86_64 version available, built on OSX 10.9 nightly, installs into /Applications/MacPorts/ /opt/openmodelica/bin/ and /opt/openmodelica/share/doc/omc/). An alternative that is fast and works on all recent versions of OSX is installing on a Linux virtual machine there are pre-built virtual machine images available. Note that the Mac builds of OpenModelica are discontinued after 1.16.
