Avoid using last positional arguments in YELP_HELP_INIT without parameters.
--- yelp-tools-3.12.0/tools/yelp.m4.orig	2014-02-02 20:28:10.000000000 +0100
+++ yelp-tools-3.12.0/tools/yelp.m4	2014-03-27 02:59:41.241812513 +0100
@@ -8,12 +8,13 @@
 YELP_LC_MEDIA_LINKS=true
 YELP_LC_DIST=true
 
-for yelpopt in [$1]; do
+for yelpopt in [$1] END; do
   case $yelpopt in
     lc-media-links)    YELP_LC_MEDIA_LINKS=true ;;
     no-lc-media-links) YELP_LC_MEDIA_LINKS= ;;
     lc-dist)           YELP_LC_DIST=true ;;
     no-lc-dist)        YELP_LC_DIST= ;;
+    END) ;;
     *) AC_MSG_ERROR([Unrecognized [YELP_HELP_INIT] option $yelpopt"]) ;;
   esac
 done;