Makefile编译问题

ruchong

CXXFLAGS=-g
OBJ=ccall.o

CC=g++
LIB=-lpthread
DEBUG=-g
DEF=-DRV_RELEASE
INCLUDE=-I ../include/sip/stackMgr/ -I ../include/sip/common/ -I ../include/sip/ \
       -I ../include/ads/  -I ../include/common/  -I ../common/ccore/netdrivers/

testSip : $(OBJ)
    $(CC) $(DEF) $(OBJ) $(LIB) $(DEBUG) $(INCLUDE) -o testSip test.cpp

clean :
    rm -rf *.o testSip

编译成功.....
但是我修改test.cpp文件的再make的时候提示:
make: `testSip' is up to date....不重新编译....是不是哪个地方写的有问题 ....