Makefile

.SUFFIXES: .in

.in:
	echo $< to $@

foo: dep

bar: dep
	echo $< to $@

test: test.in dep
	echo $< to $@

extra: extra.in dep

Test

% touch foo.in bar.in a.in extra.in test.in dep
% make foo
% make bar
echo  to bar
to bar
% make a
echo a.in to a
a.in to a
% make test
echo test.in to test
test.in to test
% make extra
echo extra.in to extra
extra.in to extra