Unresolved external symbols error when using nextInPreOrder method

[georgelivingston]

I am trying to get the location of the hyperlinks from webpage, so i have created a method named QGetRectangle in qwebframe.cpp file. When I use the method “nextInPreOrder” I am getting unresolved external symbols error when trying to build it, which is mentioned below, When I remove “o=o->nextInPreOrder();” it builds successfully. Also I tried rebuilding the whole Qt source, but still the error persists.

Machine details:
OS: Windows 8 Pro
Qt Version : 5.3.1
Compiler: JOM, MSVC 2010

File location: qt-5.3.1\qtwebkit\Source\WebKit\qt\WidgetApi\qwebframe.cpp

I m getting the following error:
@qwebframe.obj : error LNK2019: unresolved external symbol "public: class WebCore::RenderObject * __thiscall WebCore::RenderObject::nextInPreOrder(void)const " (
?nextInPreOrder@RenderObject@WebCore@@QBEPAV12@XZ) referenced in function "public: struct QPair<int,class QRectF> __thiscall QWebFrame::QGetRectangle(class QWeb
Frame const *,class QPaintDevice *,class QPainter &,class QWebElement const &)"
(?QGetRectangle@QWebFrame@@QAE?AU?$QPair@HVQRectF@@@@PBV1@PAVQPaintDevice@@AAVQPainter@@ABVQWebElement@@@Z)
C:\Qt\qt-5.3.1\qtbase\lib\Qt5WebKitWidgetsd.dll : fatal error LNK1120: 1 unresolved externals
jom: C:\Qt\qt-5.3.1\qtwebkit\Source\Makefile.widgetsapi.Debug [C:\Qt\qt-5.3.1\qt
base\lib\Qt5WebKitWidgetsd.dll] Error 1120
jom: C:\Qt\qt-5.3.1\qtwebkit\Source\Makefile.widgetsapi [debug] Error 2
jom: C:\Qt\qt-5.3.1\qtwebkit\Source\Makefile.QtWebKit [sub-widgetsapi-pri-make_first-ordered] Error 2
jom: C:\Qt\qt-5.3.1\qtwebkit\Makefile [sub-Source-QtWebKit-pro-make_first-ordered] Error 2
jom: C:\Qt\qt-5.3.1\Makefile [module-qtwebkit-make_first] Error 2@

qwebframe.h
@QPair<int, QRectF> QGetRectangle(const QWebFrame *frame, QPaintDevice *printer, QPainter &painter,const QWebElement & e);@
qwebframe.cpp
@QPair<int, QRectF> QWebFrame::QGetRectangle(const QWebFrame *frame, QPaintDevice *printer, QPainter &painter, const QWebElement & e)
{
WebCore::RenderObject * o = d->frame->document()->renderer();
//Error when using this method
o=o->nextInPreOrder();

/code snippets removed/
}@
Includes
@#include "config.h"

#include "BridgeJSC.h"
#include "CallFrame.h"
#include "Document.h"
#include "DocumentLoader.h"
#include "DragData.h"
#include "Element.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoaderClientQt.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "GCController.h"
#include "HTMLMetaElement.h"
#include "HitTestResult.h"
#include "HTTPParsers.h"
#include "IconDatabase.h"
#include "InspectorController.h"
#include "JSDOMBinding.h"
#include "JSDOMWindowBase.h"
#include "JSLock.h"
#include "JSObject.h"
#include "NetworkingContext.h"
#include "NodeList.h"
#include "Page.h"
#include "PlatformMouseEvent.h"
#include "PlatformWheelEvent.h"
#include "PutPropertySlot.h"
#include "RenderLayer.h"
#include "RenderTreeAsText.h"
#include "ScriptController.h"
#include "ScriptSourceCode.h"
#include "ScriptValue.h"
#include "Scrollbar.h"
#include "Settings.h"
#include "SubstituteData.h"
#include "SVGSMILElement.h"
#include "TiledBackingStore.h"
#include "htmlediting.h"
#include "markup.h"
#include "qt_instance.h"
#include "qt_runtime.h"
#include "runtime_object.h"
#include "runtime_root.h"
#include "wtf/HashMap.h"

#include "ColumnInfo.h"
#include "Document.h"
#include "Element.h"
#include "FloatQuad.h"
#include "FlowThreadController.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLIFrameElement.h"
#include "HitTestResult.h"
#include "Page.h"
#include "RenderGeometryMap.h"
#include "RenderLayer.h"
#include "RenderLayerBacking.h"
#include "RenderNamedFlowThread.h"
#include "RenderSelectionInfo.h"
#include "RenderWidget.h"
#include "RenderWidgetProtector.h"
#include "StyleInheritedData.h"
#include "TransformState.h"
#include <wtf/StackStats.h>

#if USE(ACCELERATED_COMPOSITING)
#include "RenderLayerCompositor.h"
#endif

#if ENABLE(CSS_SHADERS) && USE(3D_GRAPHICS)
#include "CustomFilterGlobalContext.h"
#endif

#include "qwebframe.h"
#include "PrintContext.h"
#include "QtPrintContext.h"
#include "qwebelement.h"
#include "qwebframe_p.h"
#include "qwebpage.h"
#include "qwebpage_p.h"
#include "GraphicsContext.h"
#include "RenderView.h"
#include "ResourceRequest.h"
#include "qwebscriptworld.h"
#include "qwebscriptworld_p.h"
#include "qwebsecurityorigin.h"
#include "DOMWrapperWorld.h"
#include "RenderView.h"
#include <QMultiMap>
#include <qdebug.h>
#include <qevent.h>
#include <qfileinfo.h>
#include <qpainter.h>
#if HAVE(QTPRINTSUPPORT)
#include <qprinter.h>
#endif
#include <qnetworkrequest.h>
#include <qregion.h>
#include "RenderObject.h"@

Awaiting for your help.
George