DOC_BUILD_DIR := $(BUILD_DIR)/doc
DOCS := soundbox-documentation
PDF := $(DOCS:%=$(DOC_BUILD_DIR)/%.pdf)

.PHONY: doc
doc: $(PDF)

$(BUILD_DIR)/%.pdf: %.tex
	mkdir -p $(dir $@)
	pdflatex -halt-on-error -output-directory $(DOC_BUILD_DIR) $<