strange error message

[Nicholas Kidd]

I was wondering if someone knew what these error message meant:

Makefile:483: warning: overriding commands for target
`engine/cpp/engine.o'
Makefile:362: warning: ignoring old commands for target
`engine/cpp/engine.o'
Makefile:489: warning: overriding commands for target
`engine/cpp/engine.obj'
Makefile:368: warning: ignoring old commands for target
`engine/cpp/engine.obj'

and what I have done to cause them?  I am getting them for each src
file in my project.  

thanks,
-Nick