build.sh

#!/bin/bash
set -e  # Any error will cause the script to fail

git submodule update --init --recursive

# Warn if CMake is not installed
CMAKE_PATH=`which cmake`
if [ -z "$CMAKE_PATH" ]; then
	echo CMake could not be found. Please install it by running
	echo sudo apt install cmake
	exit 1
fi

# Warn if cannot find OpenCV
OPENCV_DIR="./src/opencv"
if [ ! -d $OPENCV_DIR ]; then
	echo Could not find OpenCV.
	echo Make sure you are running this in the opencv_ffi package.
	exit 2
fi

# Build OpenCV and opencv_ffi
mkdir -p build  # -p means no error if there
cd build
cmake ../src
cmake --build . -j8
cd ..

# Copy the .so files to the .dist directory
mkdir -p dist
cp build/opencv/lib/*.so dist  # the OpenCV libraries
cp build/*.so dist  # the opencv_ffi library

cd $(dirname "$0")
SCRIPT_DIR=$(pwd)
INDENT="  "

echo 
echo Done! Your files are in the dist folder
echo To let your device find them, run this command:
echo "  echo \"export LD_LIBRARY_PATH=\\\$LD_LIBRARY_PATH:$SCRIPT_DIR/dist\" >> ~/.bashrc"
echo You only need to run this once, but run this again if you move this folder
echo This command does not affect any open terminal shells or SSH sessions.
echo You\'ll need to open a new shell or SSH again for it to take effect.