QUESTIONS:=$(wildcard *.tex)
PDFS:=$(QUESTIONS:.tex=.pdf)
PNGS:=$(QUESTIONS:.tex=.png)
JPGS:=$(QUESTIONS:.tex=.jpg)

.PHONY: all
all: $(PDFS) $(PNGS) $(JPGS)

%.jpg: %.pdf
	convert -density 600 -quality 100 $< -flatten -sharpen 0x1.0 $@

%.png: %.pdf
	convert -density 600 -quality 100 $< -flatten -sharpen 0x1.0 $@

COMMON_MK = $(shell bash -c 'upfind() { [[ -f "$$1" ]] && printf "$$1" || ([ "$$(realpath $$(dirname "$$1"))" == "/" ] || upfind "../$$1") }; upfind common.mk')
include $(COMMON_MK)