-LILYPOND_BOOK_INCLUDES = -I $(src-dir)/ -I $(outdir) -I $(input-dir) -I $(input-dir)/regression/ -I $(input-dir)/manual/ -I $(input-dir)/tutorial/ -I $(top-build-dir)/mf/$(outconfbase)/ -I $(top-build-dir)/mf/out/
-LILYPOND_BOOK_LILYPOND_FLAGS=-dgs-font-load
-LILYPOND_BOOK_FLAGS = --process="$(LILYPOND_BINARY) --backend=eps --formats=ps,png,pdf -deps-font-include -dgs-font-load --header=texidoc -I $(top-src-dir)/input/manual -dinternal-type-checking -ddump-signatures -danti-alias-factor=2 $(LILYPOND_BOOK_LILYPOND_FLAGS)"
+
+LILYPOND_BOOK_INCLUDES = -I $(src-dir)/ -I $(outdir) -I $(input-dir) -I $(input-dir)/regression/ -I $(input-dir)/manual/ -I $(input-dir)/tutorial/ -I $(top-build-dir)/mf/$(outconfbase)/ -I $(top-build-dir)/mf/out/ -I $(input-dir)/lsr/
+
+## override from cmd line to speed up.
+ANTI_ALIAS_FACTOR=2
+LILYPOND_JOBS=$(if $(CPU_COUNT),-djob-count=$(CPU_COUNT),)
+LILYPOND_BOOK_LILYPOND_FLAGS=-dbackend=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_INFO_IMAGES_DIR = $(if $(INFO_IMAGES_DIR),--info-images-dir=$(INFO_IMAGES_DIR),)
+LILYPOND_BOOK_FLAGS = --process="$(LILYPOND_BINARY) $(LILYPOND_BOOK_LILYPOND_FLAGS)" $(LILYPOND_BOOK_VERBOSE) $(LILYPOND_BOOK_INFO_IMAGES_DIR)