content: FROM rustembedded/cross:arm-unknown-linux-gnueabi
  ENV DEBIAN_FRONTEND=noninteractive
  ENV PKG_CONFIG_PATH=/usr/lib/arm-linux-gnueabi/pkgconfig
  ENV RPI_TOOLS=/rpi_tools
  ENV MACHINE=armv6
  ENV ARCH=armv6
  ENV CC=gcc
  ENV OPENSSL_DIR=/openssl
  ENV INSTALL_DIR=/openssl
  ENV CROSSCOMP_DIR=/rpi_tools/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin
  
  RUN apt-get update &&\
      apt-get install -y wget openssl libssl-dev pkg-config libudev-dev lib32z1
  
  # Get Raspberry Pi cross-compiler tools
  RUN git -C "/" clone -q --depth=1 https://github.com/raspberrypi/tools.git "${RPI_TOOLS}"
  
  # Manually cross-compile OpenSSL to link with
  
  # 1) Download OpenSSL 1.1.0
  RUN mkdir -p $OPENSSL_DIR
  RUN cd /tmp && \
      wget --no-check-certificate https://www.openssl.org/source/openssl-1.1.0h.tar.gz && \
      tar xzf openssl-1.1.0h.tar.gz
  
  # 2) Compile
  RUN cd /tmp/openssl-1.1.0h && \
      ./Configure linux-generic32 shared \
        --prefix=$INSTALL_DIR --openssldir=$INSTALL_DIR/openssl \
        --cross-compile-prefix=$CROSSCOMP_DIR/arm-bcm2708-linux-gnueabi- && \
        make depend && make && make install
  
  