Detect OS upgrades and refer users to Migration

[Rainer Müller]

On 2013-11-05 02:06, Ryan Schmidt wrote:
> Is there a way that we could detect that the OS has been upgraded so that we could refer users to the Migration wiki page? I don’t think we keep track of the last-used OS X version anywhere, but maybe it’s as simple as checking if any installed port was installed for a different OS version than the current one (e.g. we’re now on darwin 13 but there are ports installed with darwin 12).

As our base system is already targeting a specific OS release, we should
just store the platform it was built for in *_autoconf.tcl and issue an
error if that does not match on launch.

Rainer