Tony

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  1. Solved it, I was using Debian Jessie, switched to Ubuntu Xenial and everything worked with no problem. Seems the software Debian Jessie distro uses is too old or incompatible.
  2. I'm trying to follow this tutorial here https://www.pyimagesearch.com/2015/07/27/installing-opencv-3-0-for-both-python-2-7-and-python-3-on-your-raspberry-pi-2/ but nothing I do works when I get to install numpy, opencv, or darknet. When I try to build OpenCV following default instructions (or any for that matter) I get: don't know what to do and there's nothing online that helps me out. the only thing that worked was apt-get install python-opencv but it installs a very old version which I can't use for my project. Also when I try to make darknet I get:
  3. Posting this because I want to share the solution. Got this error when trying to cmake OpenCV : -- Found PNG: /usr/lib/arm-linux-gnueabihf/libpng.so (found version "1.2.50") -- Looking for /usr/include/libpng/png.h -- Looking for /usr/include/libpng/png.h - found -- Found OpenEXR: /usr/lib/arm-linux-gnueabihf/libIlmImf.so CMake Error at /usr/lib/arm-linux-gnueabihf/cmake/Qt5OpenGL/Qt5OpenGLConfig.cmake:27 (message): The imported target "Qt5::OpenGL" references the file "/usr/lib/arm-linux-gnueabihf/libQt5OpenGL.so.5.3.2" but this file does not exist. Possible reasons include: * The file was deleted, renamed, or moved to another location. * An install or uninstall procedure did not complete successfully. * The installation package was faulty and contained "/usr/lib/arm-linux-gnueabihf/cmake/Qt5OpenGL/Qt5OpenGLConfig.cmake" but not all the files it references. Call Stack (most recent call first): /usr/lib/arm-linux-gnueabihf/cmake/Qt5OpenGL/Qt5OpenGLConfig.cmake:44 (_qt5_OpenGL_check_file_exists) /usr/lib/arm-linux-gnueabihf/cmake/Qt5OpenGL/Qt5OpenGLConfig.cmake:134 (_populate_OpenGL_target_properties) cmake/OpenCVFindLibsGUI.cmake:26 (find_package) CMakeLists.txt:601 (include) When trying to reinstall qt (apt-get install qt5-default) got a message saying it was already installed, so I solved it by adding a symlink: ln -s /usr/lib/arm-linux-gnueabihf/libQt5OpenGL.so.5.3.2 /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so If you can't find your QtOpenGL library just run a find / -name "libQt*" query and see if anything similar comes up.