Quoting Malte's message from a separate issue:
"[...] there is the more general problem of the build working on some g++
versions but not others, which we've already faced in the past for other reasons
(e.g. implied #includes). This will only get worse once we start using C++11
features.
One idea: have the buildbot try to compile on as many g++ versions as we can
easily support. It should be no problem to install multiple ones in parallel,
and e.g. my notebook (Ubuntu 14.04) comes with 4.4, 4.6, 4.7 and 4.8 all in the
standard repository. Our buildbot machine seems to have 4.4, 4.5 and 4.6 [...]"
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