Custom compile command?

I'm moving an open source project (netrek) to cmake. Things are going 
great except for 1 fairly convoluted Makefile snippet listed below:

commands_mars.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
        $(CC) $(CFLAGS) $(DEP) -DDOG -c ${srcdir}/../ntserv/commands.c 
-o commands_mars.o

commands_puck.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
        $(CC) $(CFLAGS) $(DEP) -DPUCK -c ${srcdir}/../ntserv/commands.c 
-o commands_puck.o

commands.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
        $(CC) $(CFLAGS) $(DEP) -c ${srcdir}/../ntserv/commands.c -o commands.o

commands_basep.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
        $(CC) $(CFLAGS) $(DEP) -DBASEP -c 
${srcdir}/../ntserv/commands.c -o commands_basep.o

The Makefile takes the same .c file (../ntserv/commands.c) and compiles 
it multiple times passing in a different -D (-DDOG, -DPUCK) and 
outputting a different object file (-o commands_mars,
-o commands_puck).

How would I do this in cmake?

I looked at the ADD_CUSTOM_COMMAND but that doesn't seem the way to go.

Any advise?

Thanks.

--

-- 
Bob Tanner <tanner@...>                  | Phone : (952 943-8700
http://www.real-time.com, Linux, OSX, VMware | Fax   : (952)943-8500
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