I have a Dockerfile for building on Centos 6 with GCC 5.3 that looks like this:

FROM centos:6
RUN yum -y update && yum -y install centos-release-scl
RUN yum -y update && yum -y install devtoolset-4-gcc-c++
RUN scl enable devtoolset-4 ./build.sh  #Build with gcc 5

Unfortunately devtoolset-4 is no longer supported in centos-release-scl. It's not hard to find mirrors which still seem to have the file; e.g.


But I'm not sure how to install from this (or from a local download of it). Any help would be much appreciated.

NB. I know it's not ideal to use unsupported packages, but the the only alternative i can find is to build GCC from scratch, which takes so long that my docker build times out in CI.

1 Answer 1


Devtoolsets below version 6 have moved. To enable them:

yum -y install centos-release-scl
yum-config-manager --enable centos-sclo-rh-testing

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