/tmp/ccyvQxdU.o: In function `PlayGame(game*)':
io.cpp:(.text+0x2ba): undefined reference to `MoveGhosts(game*)'
/tmp/ccBke8Dg.o: In function `map3(game*)':
map.cpp:(.text+0xeda): undefined reference to `AddGhost(game*, int, int, direction)'
map.cpp:(.text+0xef5): undefined reference to `AddGhost(game*, int, int, direction)'
map.cpp:(.text+0xf10): undefined reference to `AddGhost(game*, int, int, direction)'
/tmp/ccBke8Dg.o: In function `map4(game*)':
map.cpp:(.text+0xf7c): undefined reference to `AddGhost(game*, int, int, direction)'
map.cpp:(.text+0xfad): undefined reference to `AddGhost(game*, int, int, direction)'
/tmp/ccBke8Dg.o:map.cpp:(.text+0x1633): more undefined references to `AddGhost(game*, int, int, direction)' follow
collect2: error: ld returned 1 exit status