Fixed docs make rules again.

docs/rules.mk

@@ -4,14 +4,13 @@ PDFLATEX_FLAGS = -halt-on-error -interaction=nonstopmode \
 
 .PHONY: docs
 
-docs: $(b)proposal.pdf $(b)presentation.pdf $(b)$(REPORT).pdf
+docs: $(b)proposal.pdf $(b)presentation.pdf $(b)$(REPORT).pdf $(b)$(REPORT).bbl
 
 $(b)%.pdf: $(d)%.tex
 	mkdir -p `dirname $@`
 	TEXINPUTS=$(d): pdflatex ${PDFLATEX_FLAGS} $^
 
-$(b)$(REPORT).bbl: $(d)$(REPORT).tex $(d)$(REPORT).bib
-	pdflatex ${PDFLATEX_FLAGS} $(d)$(REPORT).tex
+$(b)$(REPORT).bbl: $(d)$(REPORT).bib
 	BIBINPUTS=$(d) bibtex8 ${@:.bbl=.aux}
 	pdflatex ${PDFLATEX_FLAGS} $(d)$(REPORT).tex
 	pdflatex ${PDFLATEX_FLAGS} $(d)$(REPORT).tex