build.sh

apt-get update
apt-get install libexpat-dev
ln -s /usr/lib/x86_64-linux-gnu/libexpat.so /usr/lib/libexpat.so
su - builder -c "
mkdir -p build \
&& cd build \
&& ct-ng arm-unknown-linux-gnueabi \
&& ct-ng build"

run.sh

curdir=$(realpath $(dirname $0))
mkdir -p ${curdir}/tools ${curdir}/build
docker run -it -u root \
    -v ${curdir}/build.sh:/home/builder/build.sh \
    -v ${curdir}/tools:/home/builder/x-tools \
    -v ${curdir}/build:/home/builder/build \
    lancechen/crosstool-ng \
    sh build.sh