Help with multiple dependencies in pattern rules

[Noel David Torres Taño]

Hello all

I want to express in a Makefile that all *.o files must be compiled from their 
*.F95 sources, and that all *_m.o files depend on the *.o file (without the 
'_m'). This is because foo_m.F95 includes foo.F95, and thus if either 
foo{,_m}.F95 changes, the foo_m.o must be rebuilt.

I tried using

%.o : %.F95
        $(FC) $(FFLAGS) -o $@ -c $<

%_m.o : %.F95

but the second rule seems to be ignored.

How to achieve that?

Thanks

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