diff --git a/Makefile b/Makefile
index d5ea683..feeb30d 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,11 @@
 #   https://pypi.python.org/pypi/xml2rfc
 xml2rfc ?= xml2rfc
 #  mmark (https://github.com/miekg/mmark)
-mmark ?= mmark
+mmark ?= mmark -xml2 -page
+ifneq (,$(XML_LIBRARY))
+	mmark += -bib-id $(XML_LIBRARY) -bib-rfc $(XML_LIBRARY)
+endif
+
 
 DRAFT = draft-jennings-4572bis
 VERSION = 00
@@ -24,7 +28,7 @@ clean:
 	$(xml2rfc) -N $< -o $@ --html
 
 $(DRAFT)-$(VERSION).xml: $(DRAFT).md 
-	mmark -xml2 -page -bib-id $(XML_LIBRARY)/ -bib-rfc $(XML_LIBRARY)/  $^ $@ 
+	$(mmark) -xml2 -page $< $@
 
 $(DRAFT).diff.html: $(DRAFT)-$(VERSION).txt $(DRAFT)-old.txt 
 	htmlwdiff   $(DRAFT)-old.txt   $(DRAFT)-$(VERSION).txt >   $(DRAFT).diff.html
diff --git a/draft-jennings-4572bis.md b/draft-jennings-4572bis.md
index 9a671ba..4e2f14d 100644
--- a/draft-jennings-4572bis.md
+++ b/draft-jennings-4572bis.md
@@ -7,7 +7,7 @@
     area = "ART"
 
     [pi]
-    symrefs = "no"
+    symrefs = "yes"
     sortrefs = "yes"
 	toc = "yes"