frei0r slackbuild is failing to build with opencv (4) giving the following...

CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files:
OpenCV_INCLUDE_DIR

I have tried adding
OpenCV_INCLUDE_DIR=/usr/include/opencv4/opencv2; export OpenCV_INCLUDE_DIR
to the build script before the cmake line build it still says it can't find it even those those directories are ok.
any ideas?
regards, Tim
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