diff --git a/Makefile b/Makefile
index 5f70f28..d1da515 100644
--- a/Makefile
+++ b/Makefile
@@ -6,3 +6,12 @@ deploy: build
 build:
 	scripts/shcompile src/main.sh > zpkg && chmod +x zpkg
 
+# minimized build with lxsh
+var_exclude = TMPDIR ZPKG_.* _ZPKG_.* SSH_ADDRESS HTTP_ADDRESS PKG_PATH COMPRESSION ALLOW_ROOT UPDATE_REMOVE
+minimal: minimal-deploy
+
+minimal-deploy: minimal-build
+	scripts/server_deploy.sh
+
+minimal-build:
+	lxsh -o zpkg -m --minimize-var --exclude-var "$(var_exclude)" --minimize-fct --remove-unused src/main.sh
diff --git a/src/deploy.sh b/src/deploy.sh
index 2d0c76c..8f8c534 100644
--- a/src/deploy.sh
+++ b/src/deploy.sh
@@ -16,7 +16,7 @@ package()
     src="$tmpdir"
   fi
   (
-  cd "$src"
+  cd "$src" || exit $?
   unset list
   [ -f DEPS ] && list=DEPS
   [ -f DESC ] && list="$list DESC"
@@ -43,7 +43,7 @@ deploy_folder()
 {
   if [ -f "$1" ] && echo "$1" | grep -q '\.tar\.'"$extension\$" # file and valid extension
   then
-    cat "$1" | $pcompress -dc 2>/dev/null | tar -tf - >/dev/null 2>&1|| { echo "File '$1' is not a valid archive" && return 1; }
+    $pcompress -dc 2>/dev/null < "$1" | tar -tf - >/dev/null 2>&1|| { echo "File '$1' is not a valid archive" && return 1; }
     deploy_package "$1" "$1" || return $?
   elif [ -d "$1" ] # folder
   then
diff --git a/src/install.sh b/src/install.sh
index 9996380..c39f3d2 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -4,13 +4,14 @@
 unpack()
 {
   echo "Unpacking $1"
-  cat "$1" | $pcompress -dc 2>/dev/null | tar -xf -
+  $pcompress -dc < "$1" 2>/dev/null | tar -xf -
 }
 
 # $1 = package , $2 = prefix
 add_package_entry()
 {
   (
+    set -e
     cd "$PKG_PATH"
     if grep -q "^$1 " installed 2>/dev/null
     then