Build dependencies:
* cmake
* GL & GLU
* GLUT
* GTK (optional)
* SDL & SDL_mixer (optional)

Build:
    $ mkdir -p build
    $ cd build
    $ cmake ..
    $ make

Install:
    # make install

If you're on modern Ubuntu, you can skip the above steps by using the PPA
<https://launchpad.net/~chazomaticus/+archive/asteroid>:
    $ sudo add-apt-repository ppa:chazomaticus/asteroid
    $ sudo apt-get update
    $ sudo apt-get install asteroid

Or, if you're on Arch, you might check out the AUR package
<http://aur.archlinux.org/packages.php?ID=58766>.  (Dunno what specifically to
run to install from that.)

Play:
    $ asteroid
