--- test/runtest.sh.orig	2014-07-26 01:10:58.000000000 +0900
+++ test/runtest.sh	2020-03-01 00:23:40.000000000 +0900
@@ -19,7 +19,7 @@
 
 tmpres='/tmp/rt$$'
 
-if [ `echo -n gna` = "-n gna" ] ; then
+if [ "$(echo -n gna)" = "-n gna" ] ; then
         echo='echo'; fin='\c';
 else
         echo='echo -n'; fin='done.';