```ruby
# vi:syntax=dockerfile
# name:centos6-builder
FROM centos:6
MAINTAINER Daniele Viganò <daniele@openquake.org>

RUN yum -y upgrade && \
    yum -y groupinstall 'Development Tools' && \
    yum -y install centos-release-scl epel-release && \
    yum -y install autoconf bzip2-devel curl git gzip libtool makeself \
                   readline-devel rh-python35 spatialindex-devel sudo \
                   sqlite-devel tar which xz zip zlib-devel

ARG uid=107

RUN useradd -u $uid builder && \
echo 'builder ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

USER builder

ENV HOME /home/builder
ENV PATH=/opt/rh/rh-python35/root/usr/bin:$PATH
ENV LD_LIBRARY_PATH=/opt/rh/rh-python35/root/usr/lib64

WORKDIR ${HOME}

CMD /bin/bash
```

Install rh-python27 in Docker but do not set envs
user
```ruby
# vi:syntax=dockerfile
# name:centos6-builder
FROM centos:6
MAINTAINER Daniele Viganò <daniele@openquake.org>

RUN yum -y upgrade && \
    yum -y groupinstall 'Development Tools' && \
    yum -y install centos-release-scl epel-release && \
    yum -y install autoconf bzip2-devel curl git gzip libtool makeself \
                   readline-devel rh-python27 rh-python35 spatialindex-devel \
                   sudo sqlite-devel tar which xz zip zlib-devel

ARG uid=107

RUN useradd -u $uid builder && \
echo 'builder ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

USER builder

ENV HOME /home/builder

WORKDIR ${HOME}

CMD /bin/bash
```
assistant