--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -68,9 +68,9 @@
 option(EnableQtwebengine "Enable QtWebEngine backend (requires Qt 5.5)" OFF)
 
 if (EnableQtwebengine)
-	find_package(Qt5 5.5.0 REQUIRED COMPONENTS Core DBus Gui Multimedia Network PrintSupport Script Sql WebEngine WebEngineWidgets WebKit WebKitWidgets Widgets)
+	find_package(Qt5 5.5.0 REQUIRED COMPONENTS Concurrent Core DBus Gui Multimedia Network PrintSupport Script Sql WebEngine WebEngineWidgets WebKit WebKitWidgets Widgets)
 else (EnableQtwebengine)
-	find_package(Qt5 5.2.0 REQUIRED COMPONENTS Core DBus Gui Multimedia Network PrintSupport Script Sql WebKit WebKitWidgets Widgets)
+	find_package(Qt5 5.2.0 REQUIRED COMPONENTS Concurrent Core DBus Gui Multimedia Network PrintSupport Script Sql WebKit WebKitWidgets Widgets)
 endif (EnableQtwebengine)
 
 set(otter_src
