mkdir

Makefile

@@ -22,6 +22,9 @@ lecture_slides: $(addprefix output/,$(addsuffix .html,$(SLIDES_LIST)))
 # Define a rule to build all teaching notes
 teaching_notes: $(addprefix output/teaching_notes/,$(addsuffix .html,$(TEACHING_NOTES_LIST)))
 
+output/teaching_notes:
+	mkdir -p $@
+
 # Define a pattern rule for building a slide
 output/%.html: %.md assets/theme.css
 	docker run --rm --init -v "$(PWD)":/home/marp/app/ -e LANG=${LANG} -e MARP_USER="${UID}:${GID}" marpteam/marp-cli $< --theme-set assets/theme.css --html --allow-local-files -o $@