[MacPorts] #34369: arpack with mpich2

[MacPorts]

#34369: arpack with mpich2
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 Reporter:  ryusuke.numata@…          |       Owner:  mmoll@…           
     Type:  enhancement               |      Status:  new               
 Priority:  Normal                    |   Milestone:                    
Component:  ports                     |     Version:                    
 Keywords:                            |        Port:  arpack            
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Comment(by mmoll@…):

 Ah, I have +gcc46 as a default variant, but that variant doesn't exist for
 mpich2. Can you try if the Portfile.diff2 patch works?

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Ticket URL: <https://trac.macports.org/ticket/34369#comment:5>
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