Hi!
Since what PHP version are constants defined for the categories? The dev version uses constants, 3.5 strings.
Just in case that 4.0.6 does not provide the constants I suggest something along these lines:
defined("LC_COLLATE") ? constant("LC_COLLATE") : "LC_COLLATE"
Masi
PS: How about a 3.5.1 that fixes small things like these.