-TEXI2HTML_FLAGS += --css-ref=lilypond.css $(DOCUMENTATION_INCLUDES)
-TEXI2HTML_INIT = --init-file=$(top-src-dir)/lilypond-texi2html.init
-TEXI2HTML = $(TEXI2HTML_PROGRAM) $(TEXI2HTML_FLAGS) $(TEXI2HTML_LANG)
+TEXI2HTML_FLAGS += $(DOCUMENTATION_INCLUDES) --I=$(XREF_MAPS_DIR)
+TEXI2HTML_INIT = --init-file=$(top-src-dir)/Documentation/lilypond-texi2html.init
+TEXI2HTML = PERL_UNICODE=SD $(TEXI2HTML_PROGRAM) $(TEXI2HTML_FLAGS) $(TEXI2HTML_LANG)
+
+TEXI2PDF_FLAGS += $(DOCUMENTATION_INCLUDES)