I actually had a bit of trouble getting it compiled at first too, well more specifically getting it out of the repository. Stupid repo requiring a git:// in front instead of the normal https://
For linux users:
You'll need four things to compile on linux, and your distro probably comes with them
Those are git and g++
If you DON'T have those, you can type
sudo apt-get install g++ (then enter your admin password)
sudo apt-get install git
sudo apt-get install libncurses5
sudo apt-get install libncursesw5
But you honestly probably will not have to.
Now, for the game itself... go to the directory you want it in and go:
git clone git://github.com/Whales/Cataclysm
then:
make ("make clean" if updating to a new version)
and you should be good to go:
./cataclysm
to play. You may need to resize your screen to something larger, since the default on most systems is too small.
You shouldn't need to sudo at any point for the actual game installation.
Final note
I notice all you people complaining about errors, not one of your are posting your backtraces or otherwise helping! How is he supposed to figure out what's causing it? Especially you windows users, since he can't test it on your OS. Not that I have any idea of how to get it to run on windows or find backtraces or anything, but I'm sure there's a way.
Linux uses, remember to run it with gdb ("gdb ./cataclysm"->"r", "bt" if it crashes or "r" to reload) if you're experiencing crash problems, since that will allow him to figure them out much quicker.