OpenCV with OpenBLAS engine

[SalixManiac]

Hello,
after 3 hours of compilation, it works
gflags
numpy-legacy
python3-Cython
libaec
leptonica
tesseract
hdf5
OpenBLAS ( do not forget to declare TARGET=, minimal optimisation TARGET=NEHALEM for an Intel i7 or TARGET=ATHLON for AMD Athlon)
opencv ( sudo CVNONFREE=yes ./opencv.SlackBuild )
gmic