+## override from cmd line to speed up.
+ANTI_ALIAS_FACTOR=2
+LILYPOND_JOBS=$(if $(CPU_COUNT),-djob-count=$(CPU_COUNT),)
+LANG_TEXIDOC_FLAGS:=$(foreach lang,$(LANGS),--header=texidoc$(lang))
+LANG_DOCTITLE_FLAGS:=$(foreach lang,$(LANGS),--header=doctitle$(lang))