Using package managers like Homebrew, Fink, MacPorts, described below, is not obsolete. Those sections describe how to get Freeciv running on Mac OS X using pre-built methods. For building from source, see Build-MacOSX.
Install From Installer packageEdit
Installer packages are available on Dropbox here 
Download the version you want, and double click the "xxx.pkg" file to start the install.
Install from Homebrew Edit
Note: The commands below need to be copied and pasted into a terminal!
Head here to install Homebrew:
This is the current command to install Homebrew (check the site to make sure it hasn't changed):
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
The Homebrew base repository hosts a variety of games, too, like Freeciv. To install it, run:
brew install freeciv
Note that this downloads quite a few software development packages and command line utilities as prerequisites to the game. It can take a bit under 5 minutes to complete the overall process and uses your full CPU, so it makes sense to brew a cup of coffee in the meantime.
On Yosemite if you get error "dyld: Library not loaded: /usr/local/lib/liblzma.5.dylib" then install xz library
brew install xz
Install from Fink Edit
fink install freeciv
This will take quite a while the first time you do it. When it's done, start a game with:
Install from MacPortsEdit
Prepare Mac OS XEdit
- Install X11 and X11 SDK components. Both are available on your Mac OS X CD. However, X11 itself is also available as a download (Panther compatable download here) from Apple. (For 10.8, Mountain Lion, you will need to obtain XQuartz, see http://support.apple.com/kb/HT5293.)
- Install Xcode 1.2, 1.5 (For Panther), 2.0 (For Tiger) or 3.0 (For Leopard)
Mac Ports can be downloaded from http://www.macports.org/install.php . Here you'll find the versions for the different MAC OS X.
Having installed MacPorts, you'll be able to execute the 'port' command in Terminal. This will the download the different packages and install FeeCiv on your HD.
% sudo port install freeciv-x11 Or try: % sudo port install freeciv
Install from SourceEdit
This subject is complex enough that it has moved to its own page Build-MacOSX.