Cmake在ubuntu 18.04上找不到本地版本的opencv

Question

I have a version of OpenCV ((3.4.1) compiled and installed in /home/m/locals/opencv

the content of /home/m/locals/opencv is:

bin
include
lib
share

I have an eniroment pointing to this directory:

echo $OPENCV_ROOT
/home/m/locals/opencv

I have a cmake that tries to add opencv to project:

 file(TO_CMAKE_PATH $ENV{OPENCV_ROOT} OpenCV_DIR)
 set(BUILD_SHARED_LIBS OFF)
 find_package(OpenCV  COMPONENTS core highgui imgproc imgcodecs videoio photo stitching flann ml features2d calib3d objdetect REQUIRED)

when I run cmake, I am getting this error:

CMake Error at /usr/local/share/OpenCV/OpenCVModules.cmake:399 (message):
The imported target "opencv_core" references the file

     "/usr/local/lib/libopencv_core.so.3.4.0"

   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/local/share/OpenCV/OpenCVModules.cmake"

   but not all the files it references.

My questions:

1. Why it is trying to find OpenbCV 3.4.0, when the one that i installed is 3.4.1
2. How can I fix it and make msure that it points to the correct copy of openCV?

Answer 1

You can do export OpenCV_DIR=... as commented by @Tsyvarev. However, it may affect other builds that requires exactly 3.4.0 . Rather, set the variable in your project's CMakeLists.txt

set(OpenCV_DIR /home/m/locals/opencv/share/OpenCV)

or, you can set the variable manually when running cmake:

cmake -D OpenCV_DIR=/home/m/locals/opencv/share/OpenCV ..

Answer 2

I solved this problem by fully removing OpenCV and build it from the source. This helped me to install OpenCV 3.3 in ubuntu 18.04