1FROM gcc:latest 2WORKDIR /usr/src/unbound 3RUN apt-get update 4# install semantic parser & lexical analyzer 5RUN apt-get install -y bison flex 6# install packages used in tests 7RUN apt-get install -y ldnsutils dnsutils xxd splint doxygen netcat 8# accept short rsa keys, which are used in tests 9RUN sed -i 's/SECLEVEL=2/SECLEVEL=1/g' /usr/lib/ssl/openssl.cnf 10 11CMD ["/bin/bash"] 12