Build Error

[petertheprocess]

When I run ‘make’, it seems something wrong in the code.

Random Map Generator build starts...
g++ src/map.cpp -O3 -c -o build/map.o
src/map.cpp: In member function ‘int Map::getBlackPixelNumber()’:
src/map.cpp:77:10: error: ‘total_pixel_number’ does not name a type
     auto total_pixel_number = Map::map.rows * Map::map.cols;
          ^
src/map.cpp:78:10: error: ‘total_black_pixel_number’ does not name a type
     auto total_black_pixel_number = total_pixel_number - countNonZero(Map::map)
          ^
src/map.cpp:79:12: error: ‘total_black_pixel_number’ was not declared in this scope
     return total_black_pixel_number;
            ^
makefile:18: recipe for target 'build/map.o' failed
make: *** [build/map.o] Error 1