all: ./a/b/c a

clean: rm -rf a dir

%/.: mkdir -p $(@)

a/%/c: | ./dir/%/. @echo "@ [$@]" @echo "^ [$^]" @echo "? [$?]"

a: | ./a/b/. @echo "@ [$@]" @echo "^ [$^]" @echo "? [$?]"