dependency ladder example

slides/makefiles/dependency_ladder/makes/zoo

@@ -0,0 +1,14 @@
+filter = $(shell cowsay -l | sort -R | head -1)
+
+zoo = $(patsubst Forts/fortune_%.md,Zoo/animal-%.md,$(forts))
+
+$(zoo): Zoo/animal-%.md: Forts/fortune_%.md
+	@mkdir -p $(@D)
+	echo '```' > $@
+	cat $< | cowsay -f $(filter) >> $@
+	echo '```' >> $@
+
+progs += forts
+progs += $(zoo)
+
+dross += Zoo/