In file included from /home/tanay.c/webkit-tar/webkit/Source/WebCore/dom/EventTarget.h:35:0, from /home/tanay.c/webkit-tar/webkit/Source/WebCore/Modules/battery/BatteryManager.h:27, from /home/tanay.c/webkit-tar/webkit/Source/WebCore/Modules/battery/BatteryController.h:26, from /home/tanay.c/webkit-tar/webkit/Source/WebCore/Modules/battery/BatteryController.cpp:22: /home/tanay.c/webkit-tar/webkit/Source/WebCore/dom/EventListenerMap.h:73:5: error: ‘atomic’ in namespace ‘std’ does not name a type std::atomic<int> m_activeIteratorCount { 0 };