=== modified file 'zsh-functions/zsv_check_nfsroot'
--- zsh-functions/zsv_check_nfsroot	2014-05-12 22:44:46 +0000
+++ zsh-functions/zsv_check_nfsroot	2014-05-12 12:43:05 +0000
@@ -1,5 +1,5 @@
 typeset -g is_nfsroot
-if [[ -z $is_nfsroot ]] then
+if ! (($+is_nfsroot)); then
 	grep -q 'root=/dev/nfs' /proc/cmdline
 	is_nfsroot=$?
 fi