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It wants you to create a separate build directory (anywhere), and run cmake there. For example:
mkdir my_build_dir cd my_build_dir rm ../CMakeCache.txt cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/home/jinha/OCV/source
.. in this example telling cmake where to look for the source.
In case you didn’t remove
CMakeCache.txt before building again, it will still show this error.
So, please remember to delete
CMakeCache.txt first before running
After you have success downloaded and unzipped OpenCV sources from sources you need create simple command-file install.sh. For example, your working dir will be /home/user/myopencv
So /home/user/myopencv/install.sh will be contain next code:
#!/bin/bash rm CMakeCache.txt mkdir build cd build cmake .. -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local make make install make clean
chmod 777 install.sh ./install.sh
And after the all you will get those executable files:
[email protected]:/usr/local/bin# ls -las | grep opencv 32 -rwxr-xr-x 1 root root 29888 апр 20 18:10 opencv_annotation 244 -rwxr-xr-x 1 root root 247608 апр 20 18:10 opencv_createsamples 244 -rwxr-xr-x 1 root root 247504 апр 20 18:10 opencv_haartraining 20 -rwxr-xr-x 1 root root 18600 апр 20 18:10 opencv_performance 288 -rwxr-xr-x 1 root root 294592 апр 20 18:10 opencv_traincascade 16 -rwxr-xr-x 1 root root 14288 апр 20 18:10 opencv_version 60 -rwxr-xr-x 1 root root 61040 апр 20 18:10 opencv_visualisation