I want install open cv and when step using cmake I get stucked.

here the error

CMake Error at CMakeLists.txt:9 (find_package):
  By not providing "FindQt5Core.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt5Core", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt5Core" with any
  of the following names:



  Add the installation prefix of "Qt5Core" to CMAKE_PREFIX_PATH or set
  "Qt5Core_DIR" to a directory containing one of the above files.  If
  "Qt5Core" provides a separate development package or SDK, be sure it has
  been installed.

-- Configuring incomplete, errors occurred!
See also "/home/pi/opencv/build/CMakeFiles/CMakeOutput.log".
See also "/home/pi/opencv/build/CMakeFiles/CMakeError.log".
  • what is your question?
    – jsotola
    Sep 14, 2019 at 18:37
  • Is there any important reason why you try to install OpenCV from sources by compiling it?
    – Ingo
    Sep 15, 2019 at 9:49
  • Did you try to do what the error message tells you to do? Sep 15, 2019 at 10:06
  • i have final project to use mobilnet ssd for vehicle detection and need opencv i am really newbie and dont know what it is mean and how to fix it i still dont know , i alredy instal qt5 with sudo and it is already installed but still error when i want compile open cv Sep 16, 2019 at 13:00

1 Answer 1


Installing the under-listed packages may fix your problem.

sudo apt-get install qtbase5-dev

sudo apt-get install qtdeclarative5-dev

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