The --enable-sound ./configure option enables the sound support in crack-attack.
This commit enables the --enable-sound option, and adds a dependency on SDL_mixer.
The following files still have to be supplied by the user, due to licencing issues upstream:
~/.crack-attack/music/game.ogg
~/.crack-attack/music/gameover.ogg
~/.crack-attack/music/prelude.ogg
~/.crack-attack/music/youwin.ogg
~/.crack-attack/sounds/block_awaking.wav
~/.crack-attack/sounds/block_dying.wav
~/.crack-attack/sounds/block_fallen.wav
~/.crack-attack/sounds/countdown.wav
~/.crack-attack/sounds/garbage_fallen.wav
~/.crack-attack/sounds/garbage_shattering.wav
The crack-attack game will detect when these sound files are present, and use them as background music and sound effects.
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