TARGET=$(subst .tex,.pdf,$(wildcard *.tex))

all: $(TARGET)

%.dep: %.tex
	perl -lnwe 'print "$*.pdf: $$1" if /\\input{([\w-]+\.tex)}/' <$< >$@

include $(TARGET:.pdf=.dep)

%.pdf : %.tex
	pdflatex $<
	pdflatex $<

clean:
	latexmk -C
	rm -f *.dep

.PHONY: clean