-CHAPTERS := $(SITE) blurb intro running input output licence
+CHAPTERS := $(SITE) blurb intro running input output licence index
INPUTS = $(patsubst %,%.but,$(CHAPTERS))
all: Contents.html
-Contents.html: $(INPUTS)
+Contents.html: $(INPUTS) $(HALIBUT)
$(HALIBUT) $(INPUTS)
rm -f index.html
ln -s Contents.html index.html