[MacPorts] #57407: Digikam 4.9.0 fails to install: LibKface cannot be compiled

[MacPorts]

#57407: Digikam 4.9.0 fails to install: LibKface cannot be compiled
--------------------+---------------------
 Reporter:  mexon   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  digikam
--------------------+---------------------
 Relevant part of the log is this bit:

 :info:configure CMake Warning at
 extra/libkface/cmake/modules/MacroOpenCV.cmake:27 (find_package):
 :info:configure   Found package configuration file:
 :info:configure     /opt/local/share/OpenCV/OpenCVConfig.cmake
 :info:configure   but it set OpenCV_FOUND to FALSE so package "OpenCV" is
 considered to be
 :info:configure   NOT FOUND.
 :info:configure Call Stack (most recent call first):
 :info:configure   extra/libkface/CMakeLists.txt:32 (DETECT_OPENCV)
 :info:configure -- Great, found OpenCV on the first try.
 :info:configure -- OpenCV Root directory is: /opt/local/share/OpenCV
 :info:configure -- OpenCV: Found version 3.4.1 (required: 2.4.9)
 :info:configure -- OpenCV headers:
 /opt/local/include;/opt/local/include/opencv
 :info:configure -- OpenCV libs   :
 opencv_core;opencv_highgui;opencv_objdetect;opencv_imgproc
 :info:configure CMake Error at extra/libkface/CMakeLists.txt:113
 (message):
 :info:configure   LibKface cannot be compiled.

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Ticket URL: <https://trac.macports.org/ticket/57407>
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