L2HARGS:  Specify the HTML version we're producing, since this is what
	  we generate anyway.
diff --git a/Doc/html/Makefile b/Doc/html/Makefile
index 29561c8..0fafaf4 100644
--- a/Doc/html/Makefile
+++ b/Doc/html/Makefile
@@ -20,6 +20,9 @@
 
 BUILDINDEX=	$(TOOLSDIR)/buildindex.py
 
+# make it clear to l2h, since our support only generates HTML 4.0
+L2HARGS=	-html_version 4.0
+
 INDEXFILES=api/api.html \
 	ext/ext.html \
 	lib/lib.html \