avoiding "Portfile changed since last build; discarding previous state."

[Jeremy Lavergne]

> It is already in the manpage: "man port"
> 
> 
> 
> OPTIONS
> 
> [snip]
> 
>     -o       honor state files older than Portfile
> 
> 
> 
> Though perhaps that's not worded as clearly as it could be, or it doesn't explain what that really means to the user.

Is Google able to search our man pages (are they online)?

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