- Makefile added.

os/ass4/Makefile

+PROG	= philosophers
+
+CC		= gcc
+CFLAGS	= -ansi -Wall -Wextra -O3 -pthread
+OFILES	= host.o
+RM		= rm -f
+
+$(PROG): $(OFILES)
+	$(CC) -o $(PROG) $(OFILES) $(CFLAGS)
+
+%.o: %.c
+	$(CC) -c $< $(CFLAGS)
+
+clean:
+	$(RM) *.o $(PROG)