anchor.diff:          happy \
           icheck \
           lcov \
  +        libantlr4-runtime-dev \
           libaugeas-dev \
           libboost-all-dev \
           libbotan-2-dev \
  
positive.code: RUN apt-get update \
      && apt-get -y install \
          alex \
          automake \
          autotools-dev \
          bison \
  
negative.code:       -L https://github.com/google/googletest/archive/${GTEST_VER}.tar.gz \
      && tar -zxvf gtest.tar.gz --strip-components=1 -C ${GTEST_ROOT} \
      && rm gtest.tar.gz
  
  # PEGTL
  ARG PEGTL_VERSION=2.7.1
  