Many thanks for the help given by the three of you, Ryan, Mihai and Brandon. 
The following gives a good summary of what to do with netbpm and Brandon 
pointed out that it is wisest to do no other computing alongside any upgrade. I 
am very grateful to you all.

Barrie.

On 13 Jun 2015, at 19:46, Ryan Schmidt wrote:

> On Jun 13, 2015, at 02:56, Barrie Stott wrote:
> 
>>> Yes, if "port outdated" shows that netpbm is outdated, running "sudo port 
>>> -f deactivate netpbm" before running "sudo port upgrade outdated" is fine; 
>>> it's what I do, if I remember to do so.
>> 
>> My worry now is that if run "sudo port -f deactivate netpbm" then that newly 
>> deactivated version of netpbm will no longer register as outdated so it will 
>> not be upgraded when I run "sudo port upgrade outdated". Will I not have to 
>> run "sudo port install netpbm" straight after my forced deactivation?
> 
> You are correct that "outdated" only considers active ports.
> 
> If you have other outdated ports installed that depend on netpbm, then you 
> can deactivate netpbm and just run "sudo port upgrade outdated". netpbm will 
> be upgraded at the appropriate time, since it is a dependency of one of the 
> outdated ports. 
> 
> If you did not have any outdated ports installed that depend on netpbm, you 
> could still deactivate netpbm, then run "sudo port upgrade netpbm outdated".

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