cant compile it on arch linux

[MehdiQaos]

tetris-sdl-c/src/init.h:6:multiple definition ofwindow'; init.o:/tetris-sdl-c/src/init.h:6: first defined here tetris-sdl-c/src/init.h:7: multiple definition of render'; init.o:/tetris-sdl-c/src/init.h:7: first defined here tetris-sdl-c/src/input.h:4: multiple definition of TETROMINO_ACTION'; input.o:/tetris-sdl-c/src/input.h:4: first defined here collect2: error: ld returned 1 exit status make: *** [makefile:17: tetris_toy] Error 1