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# Dockerfile FROM ubuntu:18.04 # Install necessary packages RUN apt-get update && \ apt-get install -y software-properties-common && \ add-apt-repository -y ppa:ubuntu-toolchain-r/test && \ add-apt-repository -y ppa:git-core/ppa && \ apt-get install -y git gcc-9 g++-9 wget tar gzip rsync ninja-build # Use alternative gcc RUN update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 100 && \ update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 100