makefile and addprefix

Anyone know why the all_fail target doesn’t compile test.c but all and all2 do?

Is there some reason I can’t use addprefix directly in the list of dependency files?

OBJS        = test

O_OBJS      = $(addprefix o., ${OBJS})

.SUFFIXES: .o .c

.c.o:
    cc -c -o $@ $<

all:  ${O_OBJS}
    @echo all
    link -o test  $(addprefix o., ${OBJS}) c:o.stubs

all2:  ${O_OBJS}
    @echo all_fail2
    link -o test ${O_OBJS} c:o.stubs

all_fail:  $(addprefix o., ${OBJS})
    @echo all_fail
    link -o test  $(addprefix o., ${OBJS}) c:o.stubs

clean:
    remove o.test
    remove test

Is there some reason I can’t use addprefix directly in the list of dependency files?

I’m guessing AMU simply doesn’t support invoking functions directly from dependency lists.