diff --git a/archbox-desktop.bash b/archbox-desktop.bash
index 8a2f277..7c86786 100755
--- a/archbox-desktop.bash
+++ b/archbox-desktop.bash
@@ -12,6 +12,15 @@ install_desktop(){
     done
 }
 
+checkdep(){
+    which $1 >/dev/null 2>&1 || err "Install $1!"
+}
+
+err(){
+    echo "$(tput bold)$(tput setaf 1)==> $@ $(tput sgr0)"
+    exit 1
+}
+
 help_text(){
 cat << EOF
 USAGE: $0 <arguments>
@@ -30,7 +39,11 @@ case $1 in
     -h|--help)
         help_text
     ;;
+    -*)
+        err "Unknown option: $1"
+    ;;
     *)
+        checkdep zenity
         list_desktop="$(archbox ls --color=none -1 /usr/share/applications)"
         zenity_entry="$(echo $list_desktop | sed 's/\ /\ FALSE\ /g')"
         selected_entry=$(zenity --list --checklist --height=500 --width=450 \
diff --git a/archbox.bash b/archbox.bash
index 88f1dc1..503f4e1 100755
--- a/archbox.bash
+++ b/archbox.bash
@@ -52,7 +52,7 @@ case $1 in
         checkdep wget
         while true; do wget -O archlinux.tar.gz $2 && break; done
         msg "Extracting the tarball..."
-	checkdep tar
+	    checkdep tar
         tar xzf archlinux.tar.gz
         msg "Enabling internet connection in chroot enviroment..."
         cp /etc/resolv.conf $CHROOT/etc/resolv.conf