[MacPorts] #62847: opencv4: fix build failures for MacOS 10.7 and 10.8

[MacPorts]

#62847: opencv4: fix build failures for MacOS 10.7 and 10.8
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  opencv4  |
----------------------+----------------------

Comment (by kencu):

 it was here - not really a fix I guess:

 https://github.com/macports/macports-
 ports/blob/d275a24edbefe7f361f2aa6eb8f59648092058c0/www/webkit2-gtk-
 devel/Portfile#L195

-- 
Ticket URL: <https://trac.macports.org/ticket/62847#comment:6>
MacPorts <https://www.macports.org/>
Ports system for macOS