Dockerfile that installs python3.4 but not python3.4-config

Dockerfile

FROM ubuntu:14.04.5

COPY files /etc/files

RUN \
export BUILD_DEPS="\
build-essential \
" && \
export RUN_DEPS="\
libffi6 \
libxml2 \
python3-pip \
python3.4 \
python3.4-dev \
" && \
apt-get update -y && \
apt-get install -y --no-install-recommends $BUILD_DEPS $RUN_DEPS && \
# Install Python dependencies
pip3 install -r /etc/files/requirements.txt && \
# Remove build dependencies, lists for apt-get
apt-get purge -y --auto-remove $BUILD_DEPS && \
ls -lR /etc/apt/sources.list.d >&2 && \
rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/*