I don't understand that and I wish someone had actually talked to upstream glibmm. The need for C++11 at compile time has no effect whatsoever on already-built applications and is easy to deal with when building applications. The next version of gcc will actually use C++11 by default.
Ah, I see this in the debian/changelog file for the glibmm package:
glibmm2.4 (2.45.41. is.2.44. 0-0ubuntu1) wily; urgency=medium
* Revert 2.45 update - it requires everything to be built using C++11
-- Robert Ancell <email address hidden> Fri, 31 Jul 2015 15:46:18 +1200
I don't understand that and I wish someone had actually talked to upstream glibmm. The need for C++11 at compile time has no effect whatsoever on already-built applications and is easy to deal with when building applications. The next version of gcc will actually use C++11 by default.