diff -up mutt-1.9.1/doc/Makefile.am.lynx_no_backscapes mutt-1.9.1/doc/Makefile.am
--- mutt-1.9.1/doc/Makefile.am.lynx_no_backscapes	2018-04-12 15:30:14.881812698 +0200
+++ mutt-1.9.1/doc/Makefile.am	2018-04-12 15:30:25.632968018 +0200
@@ -109,7 +109,7 @@ uninstall-local:
 
 check:
 manual.txt: manual.html
-	-LC_ALL=C lynx -localhost -dump -nolist -nonumbers -with_backspaces -display_charset=us-ascii manual.html > $@ || \
+	-LC_ALL=C lynx -localhost -dump -nolist -display_charset=us-ascii manual.html > $@ || \
 	LC_ALL=C w3m -T text/html -I utf-8 -O utf-8 -dump < manual.html > $@ || \
 	LC_ALL=C elinks -dump -no-numbering -no-references manual.html | sed -e 's,\\001, ,g' > $@