FROM ubuntu:22.04

LABEL maintainer="Frank Denis"

SHELL ["/bin/sh", "-x", "-c"]

ENV CFLAGS=-Ofast

ENV BUILD_DEPS curl make build-essential git libevent-dev libexpat1-dev autoconf file libssl-dev byacc

RUN update-ca-certificates 2> /dev/null || true

ENV UNBOUND_GIT_URL https://github.com/NLnetLabs/unbound.git

WORKDIR /tmp