variants not preserved on upgrade

[Rainer Müller]

On 2010-08-01 00:07 , Jeremy Huddleston wrote:
> I have boost installed as +python26+universal:
> $ port installed boost
> The following ports are currently installed:
>   boost @1.42.0_0+icu+python26+universal (active)
> 
> but when upgrading, it's trying to pull in openmpi (which is a variant that conflicts with python26).

I don't see any conflicts between +openmpi and +python26 in the output
of `port variants boost` or in the Portfile. How did you come to this
assumption?

Rainer