--- a/tools/make_gpsbabel_doc.sh
+++ b/tools/make_gpsbabel_doc.sh
@@ -2,7 +2,6 @@
 set -ex
 
 perl xmldoc/makedoc
-xmllint --noout --relaxng http://docbook.org/xml/5.0/rng/docbook.rng xmldoc/readme.xml
 # the following doesn't seem to work.
 #xmllint --noout --schematron http://docbook.org/xml/5.0/sch/docbook.sch xmldoc/readme.xml
 # jing and many depedencies removed from fedora