Description
Despite the fact that -mmacosx-version-min=10.5 is being passed during compilation, `src/3rdparty/webkit/Source/WebKit/qt/QtWebKit.pro` analyzes QMAKE_HOST.version and links to libWebKitSystemInterfaceLion.a (10.7) or libWebKitSystemInterfaceMountainLion.a (10.8) which in turn reference `kCFWebServicesProviderDefaultDisplayNameKey` (only available on 10.7+).
Related forum thread (not mine): http://qt-project.org/forums/viewthread/24967