[MacPorts] #33851: qgis sets default_variants incorrectly

[MacPorts]

#33851: qgis sets default_variants incorrectly
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  vince@…           
     Type:  defect                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  2.0.4             
 Keywords:                           |        Port:  qgis              
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 qgis sets default_variants unconditionally:

 {{{
 $ grep default_variants $(port file qgis)
 default_variants        +python27 +postgis +postgresql91
 }}}

 This causes problems for users who want to use a variant different from
 one of the defaults:

 {{{
 $ sudo port install qgis +python26
 Error: qgis: Variant python26 conflicts with python27
 Error: Unable to open port: Error evaluating variants
 }}}

 You must only set +python27 as the default variant if the user has not
 already requested a different python variant. See
 wiki:PortfileRecipes#default_variants.

 Similarly, you must only set +postgresql91 as the default variant if the
 user has not already requested a different postgresql variant.

-- 
Ticket URL: <https://trac.macports.org/ticket/33851>
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