QtWebkit linkage error: Again!

[soroush]

Hi

this is pretty crazy. I've changed my -prefix option in my Qt 5.0.0 configure and make again. Source is in a new directory, But the environment, python-perl-ruby, mingw and all other things are exactly same as before. The only difference is -prefix

I have had problems with Webkit before, though applying these patches helped:

https://qt.gitorious.org/qt/qtwebkit/commit/a65d837c40c5a6f19cf983e6614b10030d81dc67?format=patch
https://qt.gitorious.org/qt/qtwebkit/commit/3651ffe993a9243a89fe965fedee9315f3ab68f4?format=patch
https://qt.gitorious.org/qt/qtwebkit/commit/5e594b14d4b0295ad562211a43fdc996437bac17?format=patch

Now I'm getting this error:

@
./libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x157): undefined reference to WebCore::HTMLMediaElement::platformMedia() const' ../libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x1b7): undefined reference toWebCore::HTMLMediaElement::platformMedia() const'
../libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x267): undefined reference to WebCore::HTMLMediaElement::platformMedia() const' ../libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x2ce): undefined reference toWebCore::HTMLMediaElement::platformMedia() const'
../libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x393): undefined reference to WebCore::HTMLMediaElement::platformMedia() const' ../libWebKit1d.a(FullScreenVideoQt.o):FullScreenVideoQt.cpp:(.text+0x352): undefined reference toWebCore::HTMLMediaElement::exitFullscreen()'
c:/mingw-x64/bin/../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../x86_64-w64-mingw32/bin/ld.exe: ../libWebKit1d.a(FullScreenVideoQt.o): bad reloc address 0x0 in section `.pdata'
collect2.exe: error: ld returned 1 exit status
Makefile.api.Debug:81: recipe for target '..\lib\Qt5WebKitd.dll' failed
@

This makes no sense. I have compiled Qt on Jan 12th successfully. Now What is this linkage error after changing prefix?