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Make C++11 support optional and explicitly check for gnu++11. Stop the build only if no C++11 support has been found and WebRTC support has been requested. Fixes: http://autobuild.buildroot.net/results/d89/d897a94a8b6a52eba03d04c24536f554a7643000 Signed-off-by: Romain Naour <romain.naour@gmail.com>
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