-DOCUMENTS:=$(patsubst %.tex,%,$(shell grep -Fl documentclass *.tex))
-LATEX?=pdflatex
-LATEXFLAGS?=--no-shell-escape -file-line-error -halt-on-error
-BIBTEX?=bibtex
-MAKEGLOSSARIES?=makeglossaries
-MAKEINDEX?=makeindex
-
-.PHONY: clean clobber all
-
-all: $(addsuffix .pdf,$(DOCUMENTS))
-
-%.pdf: %.tex $(wildcard *.tex)
- $(RM) -f $*.bcf
- $(LATEX) $(LATEXFLAGS) $*
- (grep -q '^\\bibdata{' $*.aux || [ -f $*.bcf ]; ) && $(BIBTEX) $(BIBTEXFLAGS) $* || true
- grep -q '\@istfilename' $*.aux && $(MAKEGLOSSARIES) $(MAKEGLOSSARIESFLAGS) $* || true
- [ -f $*.idx ] && $(MAKEINDEX) $(MAKEINDEXFLAGS) $* || true
- $(LATEX) $(LATEXFLAGS) $*
- $(LATEX) $(LATEXFLAGS) $*
-
-clean: $(addprefix clean-,$(DOCUMENTS))
- $(RM) texput.log
-
-clean-%:
- $(RM) $(addprefix $*.,acn acr alg aux bbl bcf blg fmt glg glo gls idx ilg ind ist loa lof log lol lot nav out snm tdo toc vrb run.xml)
-
-clobber: clean
- $(RM) -i *.pdf
+%g.jpg: %.jpg
+ convert $< -set colorspace Gray -separate -average $@
+%g.png: %.png
+ convert $< -set colorspace Gray -separate -average $@
+%g.pdf: %.pdf
+ gs \
+ -sDEVICE=pdfwrite \
+ -sProcessColorModel=DeviceGray \
+ -sColorConversionStrategy=Gray \
+ -dOverrideICC \
+ -dCompatibilityLevel=1.5 \
+ -o $@ \
+ -f $<