It would be impossible to port that to VX.
VX may use the same version of Ruby but the libraries and such are different as well as most of the core scripts in order to port this to VX you would have to rewrite almost all of VX's core scripts and the ABS script itself you would be better off using Vlad's Vampyr ABS or Vampyr Veruses Prolieum they can all be found on his site.
Here is a link:Vampyr Coders
Now this isn't even close to how good XAS is but its the best ABS for VX so far in my opinion.
If you really want to use XAS then just use RMXP.
EDIT: Eh Xzygon answered before I could post.
This post has been edited by Sgt+X+4582: Apr 24 2010, 07:51 AM