[MacPorts] #32452: Use postgresql91 by default in py26-mapnik port

[MacPorts]

#32452: Use postgresql91 by default in py26-mapnik port
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 Reporter:  shirshegsm@…          |       Owner:  dbsgeo@…        
     Type:  enhancement           |      Status:  new             
 Priority:  Normal                |   Milestone:                  
Component:  ports                 |     Version:                  
 Keywords:                        |        Port:  py26-mapnik     
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Comment(by dbsgeo@…):

 Mapnik does not depend on postgres. Mapnik uses a plugin architecture for
 datasources, so if postgres is available the "postgis.input" dynamic
 library is built so Mapnik will have postgres read support. Mapnik 2.0
 (the latest release) supports all modern versions of postgres and postgis.

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Ticket URL: <https://trac.macports.org/ticket/32452#comment:4>
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