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If we want to cross-compile OpenCV for ARM, OpenCV source files contain some script files for Cmake to create make files

download the OpenCV sources and extract it to where if we want (for example /opt and version 2.4.9) copy the (for ARM with CUDA) from /opt/opencv-2.4.9/platforms/scripts/ to /opt/opencv-2.4.9/platforms/linux/ or change the -DCMAKE_TOOLCHAIN_FILE option (open the scrip file) with ../linux/arm-gnueabi.toolchain.cmake

if we want to change (we may need to change gcc version and cuda toolkit path), add or delete some optional parameters open our copied (.../platforms/linux/ and do what if we want then close

or use (for ARM without CUDA) then check the toolchain file which is arm-gnueabi.toolchain.cmake at the .../platforms/linux/

we should check gcc and g++ version for just toolchain file

then go to the script file's folder from terminal then type (I used sudo sh ./ and enter it will set build files probably with no error

go to the build folder (which we can see from script files 3rd line) from terminal then

sudo make

we must not use -j<n> option for make (I'm trying it with make errors 6 hours -_- ) when it finish

sudo make install

I've installed by this way just before wrote this.