c++ under SCO Xenix

[Dave Armbrust]

I am interested in looking at running c++ on an SCO Xenix system.
I currently have the latest version of SCO Dev Sys which fully
supports ansi c.

Could someone advise me what it would take to add c++ to my
current system and what concerns I will have about portability.

Is c++ stable enought to develop a systems under or is it going
through rapid changes at this point.  I do want a mature product.

Please do not suggest any DOS solutions other then as a portability
concern.  I want to do all development under SCO Xenix or Unix
and only port to DOS completted and hopefully debuged programs.