-EXTRA_DIST_FILES +=$(TELY_FILES) $(LY_FILES) $(ITEXI_FILES) $(ITELY_FILES) $(ILY_FILES)
-
-
-DVIPS_FLAGS= -h $(subst .pdf,.psfonts,$(subst .ps,.psfonts, $(notdir $@ )))
-
+# prerequisites for all rules invoking compiled lilypond binary
+ifeq ($(LILYPOND_EXTERNAL_BINARY),)
+INIT_LY_SOURCES = $(wildcard $(top-src-dir)/ly/*.ly)
+SCHEME_SOURCES = $(wildcard $(top-src-dir)/scm/*.scm)
+endif