On Windows, WebKit/Qt fails to build since JSONObject in JavaScriptCore and JSONObject in WebCore are both built and their .obj files dropped into the same directory (WebKitBuild\<build>\WebCore\obj) using the build-webkit --qt script. Thus, link errors occur since either JSC::JSONObject or WebCore::JSONObject fail to build.
*** This bug has been marked as a duplicate of 26293 ***