[MacPorts] #33849: py26-openbabel: update to 2.3.0

[MacPorts]

#33849: py26-openbabel: update to 2.3.0
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 Reporter:  atenderholt@…          |       Owner:  macports-tickets@…                   
     Type:  update                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.0.4                                
 Keywords:  haspatch               |        Port:  py26-openbabel                       
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Comment(by atenderholt@…):

 Replying to [comment:1 ryandesign@…]:
 > In the future, for existing ports, please supply a unified diff of your
 changes instead of a complete new port; that makes it easier to review
 your proposed changes.

 Thanks for the tip, I completely forgot that a diff is more appropriate.

 > `-I${prefix}/include/openbabel-2.0` does not belong in build.target. It
 might belong in build.args but I'm still uncomfortable about hardcoding
 that value, specifically the 2.0 version number which seems likely to
 change in future versions of openbabel. Is there a way to ask openbabel
 for this value -- maybe via a config script or pkg-config?

 I'm not sure why, but pkg-config expects openbabel-2.0 to be passed to it
 instead of openbabel or openbabel-${version}. Nothing in the openbabel
 Portfile suggests why this is the case. What is the best way to proceed?

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Ticket URL: <https://trac.macports.org/ticket/33849#comment:2>
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