timestamp=$(shell date +%Y-%m-%d_%H:%M)

all: texte1

texte1: texte1.tex
	@latexmk -pdf texte1.tex
	@if ! cmp --silent build/texte1.pdf texte1_*.pdf; then \
		touch texte1_tmp.pdf; \
		rm texte1*.pdf; \
		cp build/texte1.pdf texte1_${timestamp}.pdf; \
		echo "Updated"; \
	fi

clean:
	@rm -rf build 2>/dev/null