ansible: use gcc 4.9.4 or newer on CentOS 6 #1203
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Currently CentOS 6 machines use gcc 4.8 while Node.js requires "gcc and g++ 4.9.4 or newer". See #762.
devtoolset-3
has gcc 4.9.1, too old.devtoolset-5
has "gcc (GCC) 5.3.1 20160406", that's still older than gcc 4.9.4.devtoolset-6
has "gcc (GCC) 6.3.1 20170216", good enough.The CERN repo doesn't have
devtoolset
newer than 2, so I replaced that with Software Collections, just like in #809.