+## override from cmd line to speed up.
+ANTI_ALIAS_FACTOR=2
+LILYPOND_JOBS=$(if $(CPU_COUNT),-djob-count=$(CPU_COUNT),)
+LILYPOND_BOOK_LILYPOND_FLAGS=--backend=eps --formats=ps,png,pdf $(LILYPOND_JOBS) -dinclude-eps-fonts -dgs-load-fonts --header=texidoc -I $(top-src-dir)/input/manual -dcheck-internal-types -ddump-signatures -danti-alias-factor=$(ANTI_ALIAS_FACTOR)
+LILYPOND_BOOK_VERBOSE = --verbose
+LILYPOND_BOOK_FLAGS = --process="$(LILYPOND_BINARY) $(LILYPOND_BOOK_LILYPOND_FLAGS)" $(LILYPOND_BOOK_VERBOSE)
+TEXINPUTS=$(top-src-dir)/tex/::
+export TEXINPUTS