On Arch, running MC Pi would get an error, say it can't find the two files libpng12.so.0 and libSDL-1.2.so.0.
So, I used the following commands...
sudo pacman -S sdl yaourt -S libpng12
...to install the libraries.
Then I got another error "failed to open vchiq instance", and I found a solution at there: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=66&t=7104&start=25
Finally, it just opened a black window: http://i.stack.imgur.com/7Tf6F.png