Make base prefix sigils error out if no number following Prefix sigils (0x, %, &, @, $) were parsing to 0 if there was no number following the prefix. Make parsing fail if that is the case. Note that in a couple of obscure cases, it may give "undefined symbol" rather than "bad operand" due to some interactions with other unfortunate features of the source format.

all:
	rm -f manual/*.pdf manual/*.html
	docbook2html -o manual manual.docbook.sgml
	docbook2html -u manual.docbook.sgml && mv manual.docbook.html manual/manual.html
	docbook2pdf -u manual.docbook.sgml && mv manual.docbook.pdf manual/manual.pdf
	rm -f manual.docbook.html

maint:
	hg rm manual/* || true
	$(MAKE) all
	hg add manual/*