In file included from /in/Compile/check.cpp:7:
/in/sokoban.hpp:473:10: error: private field 'edge_ok' is not used [-Werror,-Wunused-private-field]
    bool edge_ok[4];                                            // 0:U, 1:L, 2:D, 3:R
         ^
1 error generated.
/in/Compile/Makefile:16: recipe for target 'main' failed
make: *** [main] Error 1