[MacPorts] #50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed

[MacPorts]

#50709: port:opencv+qt4 uses Qt5 if both Qt4 and Qt5 are installed
--------------------------+--------------------------------
  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:  opencv       |
--------------------------+--------------------------------

Comment (by rjvbertin@…):

 Building +qt4 when Qt5 is also installed turns out not to require many
 modifications:

 {{{
 --- /opt/local/var/macports/sources/default-ports/graphics/opencv/Portfile
 2016-02-24 16:35:31.000000000 +0100
 +++ /opt/local/site-ports/graphics/opencv/Portfile      2016-02-24
 19:47:41.000000000 +0100
 @@ -208,13 +208,13 @@
  variant qt4 conflicts qt5 description {Build with Qt4 Backend support.} {
      PortGroup               qt4 1.0
      configure.args-replace  -DWITH_QT=OFF \
 -                            -DWITH_QT=ON
 +                            -DWITH_QT=4
  }

  variant qt5 conflicts qt4 description {Build with Qt5 Backend support.} {
      PortGroup               qt5 1.0
      configure.args-replace  -DWITH_QT=OFF \
 -                            -DWITH_QT=ON
 +                            -DWITH_QT=5
  }

  variant java description {Add Java bindings.} {
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/50709#comment:2>
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