OS and Xcode versions on buildbots

[David Evans]

Can anyone state authoritatively which OS version and versions of Xcode
are currently being used on each of the MacPorts buildbots?  Is this
documented anywhere?  Do we have a stated policy on this matter and an
implementation mechanism?

I'm asking because I'm seeing different results between some builds on
my local system and on the buildbots and am suspicious in at least one
case that Xcode version is the differentiating factor.

Thanks

Dave Evans