set(puzzle15_lib_sources
  inc/puzzle15/assertions.h
  inc/puzzle15/platform_ifaces.h
  inc/puzzle15/geo.h src/geo.cpp
  inc/puzzle15/game.h src/game.cpp
  inc/puzzle15/game_events.h
  inc/puzzle15/game_stats.h
  inc/puzzle15/board.h src/board.cpp)