-# LILYPONDPREFIX=$(LILYPONDPREFIX)/.. $(PYTHON) $(LILYPOND_BOOK) $(LILYPOND_BOOK_INCLUDES) --dependencies --outdir=$(outdir) --format=texi $<
- $(PYTHON) $(LILYPOND_BOOK) $(LILYPOND_BOOK_INCLUDES) --dependencies --outdir=$(outdir) --format=texi $<
+ set|egrep '(TEX|LILY)'
+
+ $(PYTHON) $(LILYPOND_BOOK) $(LILYPOND_BOOK_INCLUDES) --dependencies --outdir=$(outdir) --format=texi --verbose $(LILYPOND_BOOK_FLAGS) $<
+ chmod -w $@
+
+$(outdir)/%.texi: $(outdir)/%.tely
+ rm -f $@
+ $(PYTHON) $(LILYPOND_BOOK) $(LILYPOND_BOOK_INCLUDES) --dependencies --outdir=$(outdir) --format=texi $(LILYPOND_BOOK_FLAGS) $<
+ rm -f $<