--- a/help/Makefile
+++ b/help/Makefile
@@ -10,6 +10,7 @@
 --param use.id.as.filename 1 \
 --param xref.with.number.and.title 0 \
 --xinclude \
+--nonet \
 --stringparam html.stylesheet "../style.css"
 
 dist_files += help/Makefile help/README \