First i tried with installing libopenal0a, that didn't work. Then i tried to compile engine: i downloaded source, read readme and went to directory and wrote "make". I got error:
code/SDL12/include/SDL_config_minimal.h:38: error: conflicting types for ‘size_t’
/usr/lib/gcc/x86_64-linux-gnu/4.3.2/include/stddef.h:214: error: previous declaration of ‘size_t’ was here