- [ -z $use_html ] || libs="$libs html"
- [ -z $use_adv ] || libs="$libs adv"
- [ -z $use_core ] || libs="$libs core"
- [ -z $use_xml ] || libs="$libs xml"
- [ -z $use_base ] || libs="$libs base"
+ [ -z "$use_html" ] || libs="$libs html"
+ [ -z "$use_adv" ] || libs="$libs adv"
+ [ -z "$use_core" ] || libs="$libs core"
+ [ -z "$use_xml" ] || libs="$libs xml"
+ [ -z "$use_base" ] || libs="$libs base"