===>  Installing for opencv-3.4.1_8
===>  Checking if opencv already installed
===>   Registering installation for opencv-3.4.1_8
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/conditioning.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/fundamental.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/io.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/numeric.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/projection.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/reconstruct.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/robust.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/simple_pipeline.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/include/opencv2/sfm/triangulation.hpp:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/lib/libopencv_sfm.so:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/lib/libopencv_sfm.so.3.4:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/lib/libopencv_sfm.so.3.4.1:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/share/OpenCV/3rdparty/lib/libcorrespondence.a:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/share/OpenCV/3rdparty/lib/libmultiview.a:No such file or directory
pkg-static: Unable to access file /usr/obj/ports/usr/ports/graphics/opencv/work/stage/usr/local/share/OpenCV/3rdparty/lib/libnumeric.a:No such file or directory
*** Error code 74

Stop.
make[1]: stopped in /usr/ports/graphics/opencv
*** Error code 1

Stop.
make: stopped in /usr/ports/graphics/opencv