A simple question about writing a Makefile

[warrener]

I have main.cc and test.h files,
main.cc includes test.h

Here is the Makefile, but it doesn't work. any clue?

main : main.o                                                                                                                                                                
        g++ -g main.o -o main                                                                                                                                                
main.o : main.cc test.h                                                                                                                                                      
        g++ -o main.o -c -g test.h main.cc