anchor.diff:          libcurl4-openssl-dev \
           libffi-dev \
           libgdbm-dev \
  +        libidn11 \
           liblzma-dev \
           libncurses5-dev \
  +        libncursesw5 \
           libnss3-dev \
           libreadline-dev \
           libsqlite3-dev \
           libssl-dev \
  +        libtinfo5 \
           locales \
           lsb-release \
           net-tools \
  
positive.code:         wget \
          zip \
          zlib1g-dev
  
  # Install patchelf.
  RUN curl -sS https://releases.nixos.org/patchelf/patchelf-0.9/patchelf-0.9.tar.bz2 | tar -C /tmp -xj && \
  
negative.code: # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # Copy some commonly linked library versions from xenial for backwards
  # compatibility with older builds.
  FROM ubuntu:16.04 as xenial
  ENV DEBIAN_FRONTEND noninteractive
  RUN apt-get update && \
      apt-get install -y \
        libcurl3-gnutls \
        libffi6 \
        libnettle6 \
        libssl1.0.0
  
  FROM ubuntu:20.04
  
  RUN mkdir /data
  