opencv4 Issue

[WirthmU]

I am using Raspbian GNU/Linux 10 (buster) but still get the opencv4 error:

Package opencv4 was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv4.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv4' found

Checking gives the following:

pi@allsky:~ $ pkg-config --libs opencv
-lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_datasets -lopencv_dpm -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hdf -lopencv_line_descriptor -lopencv_optflow -lopencv_video -lopencv_plot -lopencv_reg -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_rgbd -lopencv_viz -lopencv_surface_matching -lopencv_text -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_flann -lopencv_xobjdetect -lopencv_objdetect -lopencv_ml -lopencv_xphoto -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_photo -lopencv_imgproc -lopencv_core

pi@allsky:~ $ pkg-config --cflags opencv
-I/usr/include/opencv

pi@allsky:~ $ pkg-config --cflags --libs opencv
-I/usr/include/opencv -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_datasets -lopencv_dpm -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hdf -lopencv_line_descriptor -lopencv_optflow -lopencv_video -lopencv_plot -lopencv_reg -lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_rgbd -lopencv_viz -lopencv_surface_matching -lopencv_text -lopencv_ximgproc -lopencv_calib3d -lopencv_features2d -lopencv_flann -lopencv_xobjdetect -lopencv_objdetect -lopencv_ml -lopencv_xphoto -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_photo -lopencv_imgproc -lopencv_core

pi@allsky:~ $ dpkg -l | grep -i opencv
ii  libopencv-calib3d-dev:armhf           3.2.0+dfsg-6                            armhf        development files for libopencv-calib3d3.2
ii  libopencv-calib3d3.2:armhf            3.2.0+dfsg-6                            armhf        computer vision Camera Calibration library
ii  libopencv-contrib-dev:armhf           3.2.0+dfsg-6                            armhf        development files for libopencv-contrib3.2
ii  libopencv-contrib3.2:armhf            3.2.0+dfsg-6                            armhf        computer vision contrlib library
ii  libopencv-core-dev:armhf              3.2.0+dfsg-6                            armhf        development files for libopencv-core3.2
ii  libopencv-core3.2:armhf               3.2.0+dfsg-6                            armhf        computer vision core library
ii  libopencv-dev                         3.2.0+dfsg-6                            armhf        development files for opencv
ii  libopencv-features2d-dev:armhf        3.2.0+dfsg-6                            armhf        development files for libopencv-features2d3.2
ii  libopencv-features2d3.2:armhf         3.2.0+dfsg-6                            armhf        computer vision Feature Detection and Descriptor Extraction library
ii  libopencv-flann-dev:armhf             3.2.0+dfsg-6                            armhf        development files for libopencv-flann3.2
ii  libopencv-flann3.2:armhf              3.2.0+dfsg-6                            armhf        computer vision Clustering and Search in Multi-Dimensional spaces library
ii  libopencv-highgui-dev:armhf           3.2.0+dfsg-6                            armhf        development files for libopencv-highgui3.2
ii  libopencv-highgui3.2:armhf            3.2.0+dfsg-6                            armhf        computer vision High-level GUI and Media I/O library
ii  libopencv-imgcodecs-dev:armhf         3.2.0+dfsg-6                            armhf        development files for libopencv-imgcodecs3.2
ii  libopencv-imgcodecs3.2:armhf          3.2.0+dfsg-6                            armhf        computer vision Image Codecs library
ii  libopencv-imgproc-dev:armhf           3.2.0+dfsg-6                            armhf        development files for libopencv-imgproc3.2
ii  libopencv-imgproc3.2:armhf            3.2.0+dfsg-6                            armhf        computer vision Image Processing library
ii  libopencv-ml-dev:armhf                3.2.0+dfsg-6                            armhf        development files for libopencv-ml3.2
ii  libopencv-ml3.2:armhf                 3.2.0+dfsg-6                            armhf        computer vision Machine Learning library
ii  libopencv-objdetect-dev:armhf         3.2.0+dfsg-6                            armhf        development files for libopencv-objdetect3.2
ii  libopencv-objdetect3.2:armhf          3.2.0+dfsg-6                            armhf        computer vision Object Detection library
ii  libopencv-photo-dev:armhf             3.2.0+dfsg-6                            armhf        development files for libopencv-photo3.2
ii  libopencv-photo3.2:armhf              3.2.0+dfsg-6                            armhf        computer vision computational photography library
ii  libopencv-shape-dev:armhf             3.2.0+dfsg-6                            armhf        development files for libopencv-shape3.2
ii  libopencv-shape3.2:armhf              3.2.0+dfsg-6                            armhf        computer vision shape descriptors and matchers library
ii  libopencv-stitching-dev:armhf         3.2.0+dfsg-6                            armhf        development files for libopencv-stitching3.2
ii  libopencv-stitching3.2:armhf          3.2.0+dfsg-6                            armhf        computer vision image stitching library
ii  libopencv-superres-dev:armhf          3.2.0+dfsg-6                            armhf        development files for libopencv-superres3.2
ii  libopencv-superres3.2:armhf           3.2.0+dfsg-6                            armhf        computer vision Super Resolution library
ii  libopencv-ts-dev:armhf                3.2.0+dfsg-6                            armhf        development files for TS library of OpenCV (Open Computer Vision)
ii  libopencv-video-dev:armhf             3.2.0+dfsg-6                            armhf        development files for libopencv-video3.2
ii  libopencv-video3.2:armhf              3.2.0+dfsg-6                            armhf        computer vision Video analysis library
ii  libopencv-videoio-dev:armhf           3.2.0+dfsg-6                            armhf        development files for libopencv-videoio3.2
ii  libopencv-videoio3.2:armhf            3.2.0+dfsg-6                            armhf        computer vision Video I/O library
ii  libopencv-videostab-dev:armhf         3.2.0+dfsg-6                            armhf        development files for libopencv-videostab3.2
ii  libopencv-videostab3.2:armhf          3.2.0+dfsg-6                            armhf        computer vision video stabilization library
ii  libopencv-viz-dev:armhf               3.2.0+dfsg-6                            armhf        development files for libopencv-viz3.2
ii  libopencv-viz3.2:armhf                3.2.0+dfsg-6                            armhf        computer vision 3D data visualization library
ii  libopencv3.2-java                     3.2.0+dfsg-6                            all          Java bindings for the computer vision library
ii  libopencv3.2-jni                      3.2.0+dfsg-6                            armhf        Java jni library for the computer vision library
ii  opencv-data                           3.2.0+dfsg-6                            all          development data for opencv

Originally posted by @WirthmU in https://github.com/thomasjacquin/allsky/issues/516#issuecomment-932161262

[linuxkidd]

• Can you check the contents of the Makefile -- does it have the lines looking like these in the repo version ( Lines 11 through 16 ).
• If there's any difference, please try updating your allsky contents so it matches what's in the repository and retry the install.sh script.

If they do look the same, can you provide the output of this command:

pkg-config --exists opencv && echo Yes || echo No

[WirthmU]

With the latest commits the error is gone.

[linuxkidd]

Great to hear! We'll close the issue.