gnu make tutorial

[M.W. Chang]

After reading the manual, I have another quesiton:

this is the new way:

program.o : program.prg
%.prg : %.o
<tab>gharbour $<

I tried to translate the rule using the old way:

.prg.o:
<tab>gharbour $<

and didn't work. It reported this error:

gcc: program.o: No such file or directory

DO you happen to know why? Something with implicit rule?