===================================================================
RCS file: /cvs/mandoc/gmdiff,v
retrieving revision 1.5
retrieving revision 1.6
diff -u -p -r1.5 -r1.6
--- mandoc/gmdiff	2017/02/06 03:48:33	1.5
+++ mandoc/gmdiff	2017/05/18 14:45:34	1.6
@@ -43,7 +43,7 @@ while [ -n "$1" ]; do
   ${MANDOC:=mandoc} -Ios='OpenBSD ports' $MOPT $file \
     2> /tmp/mandoc.err > /tmp/mandoc.out
   for i in roff mandoc; do
-    [[ -s /tmp/$i.err ]] && echo "$i errors:" && cat /tmp/$i.err
+    [ -s /tmp/$i.err ] && echo "$i errors:" && cat /tmp/$i.err
   done
   diff -au /tmp/roff.out /tmp/mandoc.out 2>&1
 done