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'make' does not recompile when source file has been edited
Cell grid[GRID_HEIGHT][GRID_WIDTH];

#define GRID_HEIGHT 10
#define GRID_WIDTH 10

CC = gcc
OBJECTS = main.o functions.o

Game of Life : $(OBJECTS)
    $(CC) $(OBJECTS) -o Game of Life -lncurses

%.o : %.c
    $(CC) -c $<

%.o : functions.h

%.o : %.c functions.h
    $(CC) -c $< -o $@

CC = gcc
OBJECTS = main.o functions.o

%.o : %.c
    $(CC) -MD -c $<

-include $(OBJECTS:.o=.d)