2R.M. Klippstein: I'm compiling with both MCP2 and eCS 2.2, and I see no problems. VBoxACPI -- what do you mean? IASL errors?
RC error? Hm. Is it somewhere complained about that error already? I don't remember what's the problem already. A week ago,
I compiled the VBox sources in eCS 2.2 VM under Linux host -- no problems, all build time dependencies were the latest from the Netlabs-exp
repository. I don't have ArcaOS, so no idea. Maybe, you're using Netlabs-rel?
PS: in r199, only Additions were updated, so you'll not get any advantages compiling all VBox sources.