[MacPorts] #27800: opencv+libdc1394 breaks iSight FireWire camera compatibility; no qt4 support.

[MacPorts]

#27800: opencv+libdc1394 breaks iSight FireWire camera compatibility; no qt4
support.
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 Reporter:  njbutko@…          |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  1.9.2                                
 Keywords:                     |        Port:  opencv                               
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 By default, macports opencv2.2 tries to install and link to libdc1394,
 which makes old iSight cameras not work. There is no variant to turn
 libdc1394 off.

 Also, there are no variants to enable the new qt4 backend for graphical
 interfaces.

 I am attaching a patch with two improvements:

 1) libdc1394 variant makes libdc1394 support opt-in.
 2) qt4 variant enables qt4 backend for graphical interface.

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Ticket URL: <https://trac.macports.org/ticket/27800>
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