Simplify build

all: $(PDFS) clean 

%.pdf: %.tex exam_seating_map.cls

	rubber --texpath .. --inplace --pdf $< 

	pdflatex --output-directory=rooms $< 

clean: 

	rubber --clean --inplace rooms/*.tex

	rm -f rooms/*.aux rooms/*.log rooms/*.out

cleanall: 

	rm -f *.toc *.pdf *.aux *.log *.out