Not everyone has the most recent versions of the compilers, either; my institution is still working on the upgrade path from Ubuntu 12.04 LTS to 14.04 LTS, so I

Not everyone has the most recent versions of the compilers, either; my institution is still working on the upgrade path from Ubuntu 12.04 LTS to 14.04 LTS, so I had to get a modern gcc manually compiled to get proper C++11 support, because nothing in the 12.04 package manager had full support.