Cartes du Ciel is free software released under the terms of the
GNU General Public License
The simplest way is to install the Indiserver package for Mac OS X available from http://www.cloudmakers.eu/xindi
Wine is required to compute the artificial satellites position in the Calendar.
The easiest way is to install a pre-build package available from https://dl.winehq.org/wine-builds/macosx/download.html
See also http://wiki.winehq.org/MacOSX
If you also want the Iridium flare prediction with the satellites pass you need to install the DOSBox software.
sudo cp /Applications/DOSBox.app/Contents/MacOS/DOSBox /opt/local/bin/dosbox