--- src/triggers/post-compile/ssh-authkeys-split.orig	2018-07-12 07:50:58 UTC
+++ src/triggers/post-compile/ssh-authkeys-split
@@ -73,7 +73,7 @@ do
     seq=0
     while read line
     do
-        (( seq++ ))
+	seq=$(( $seq + 1 ))
         [ -z "$line" ] && continue
         f=$SKD/$base@$seq.pub
         echo "$line" > $f