Hello. I noticed there doesn't seem to be any builds for Raspberry PI posted yet.
OpenXcom works pretty well on that platform, even without overclocking. DOS emulation is pretty painful, so a native version is really the only way to play X-COM on it.
I'll attach my Raspbian Wheezy binary and a quick build script I put together.
Note: my binary has one patch applied, which you can optionally apply in the build script. It is just a fix for improveStat in BattleUnit.cpp that should make it correspond better to
https://www.ufopaedia.org/index.php?title=Experience#Primary_Statsedit 8/15/2014:
I forgot to mention something about dependencies here. With this build, you do not have to worry about yaml-cpp. Since the version in the repositories is too old, v0.5.1 is statically linked. So you should just need the SDL libraries:
sudo apt-get install libsdl1.2debian libsdl-mixer1.2 libsdl-image1.2 libsdl-gfx1.2-4
Update 04/16/2017:
I updated the build script source URLs, and made a few improvements. It should now use all cores available when building.