Makefile：无规则可作为目标

我正在遵循有关makefile的指南，但是我对上一个示例完全不了解，并且由于出现错误，我无法使makefile工作make: *** No rule to make target "obj/date.o", needed by "Whatsapp". Stop.

这是我的makefile：

IDIR = ../include
CC = gcc
CFLAGS = -I$(IDIR)

ODIR = obj
LDIR = ../lib

LIBS = -lncurses

# Keep the alphabetical order!
_DEPS = \
constants.h\
date.h\
inOut.h\
languages.h\
message.h\
mycurses.h\
mysocket.h\
text.h\
time.h\
user.h\

DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))

# Keep the alphabetical order!
_OBJ = \
date.o\
inOut.o\
languages.o\
main.o\
message.o\
mycurses.o\
mysocket.o\
text.o\
time.o\
user.o\

OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))

# these two lines should tell the compilator that my .o files depend by .c files, don't they?
$(ODIR)/%.o: %.c $(DEPS)
    $(CC) -c -o $@ $< $(CFLAGS)

Whatsapp:   $(OBJ)
    $(CC) -o $@ $^ $(CFLAGS) $(LIBS)

.PHONY: clean

clean:
    rm -f $(ODIR)/*.o *~ core $(INCDIR)/*~ 

显然，我所有的人*.c都在当前文件夹中，所以我真的不知道自己缺少什么。

为了更加清楚，这是当前文件夹的内容：

urbijr@urbijr-VirtualBox:/media/sf_Whatsapp_CLIENT$ ls
constants.h  indexbook.txt  languages.c  makefile              message.h    mycurses.h  text.c  time.h
date.c       inOut.c        languages.h  message.c             message.txt  mysocket.c  text.h  user.c
date.h       inOut.h        main.c       message_for_user.txt  mycurses.c   mysocket.h  time.c  user.h