"In-source builds are not allowed" in cmake

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

Note the .. 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 cmake.

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:

root@cartman:/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

Enjoy!

"In-source builds are not allowed" in cmake

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