Qt Creator with VS2010 toolchain: .obj file not found

[Asperamanca]

Hi,

I want to try out Qt Creator with the VS2010 tool chain. I have a single .pro file, which should create an application. The project compiles just fine, but during linking, I get the error message:
@
QtnOfficePopupWindow.obj:-1: error: LNK2019: unresolved external symbol __imp__SHAppBarMessage@8 referenced in function "public: class QPoint __thiscall Qtitan::OfficePopupWindow::getPosition(void)const " (?getPosition@OfficePopupWindow@Qtitan@@QBE?AVQPoint@@XZ)@

Or the "pretty" variant:
@
"File not found: QtnOfficePopupWindow.obj"@

(I guess it's just the first object file the linker is trying to access)

However, the object file is exactly where it should be, in the project's OBJECTS_DIR.
Where else might the linker be looking?

EDIT: Qt Creator 2.4.1 based on Qt SDK
VS2010 toolchain added simply by referring to the qmake file in my (working) Qt_VS2010 build.

EDIT2: Further info
linker command line:
@ link /LIBPATH:"c:\QtVS2010\4.8.0\lib" /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /MANIFEST /MANIFESTFILE:"./win32msvc2010_debug.obj\HipaseTool.intermediate.manifest" /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /OUT:win32msvc2010_debug\HipaseTool.exe @C:\Users\shy_schr\AppData\Local\Temp\HipaseTool.exe.6096.358.jom@

.pro file:

@TEMPLATE = app
TARGET = HipaseTool
QT += core gui network xml svg opengl
CONFIG += debug
DEFINES += QT_LARGEFILE_SUPPORT QTITAN_LIBRARY_STATIC QT_XML_LIB QT_SVG_LIB QT_NETWORK_LIB QT_OPENGL_LIB

win32-g++ {
HIPASEPLATFORM="win32gnu"
}
win32-msvc {
HIPASEPLATFORM="win32msvc"
}
win32-msvc2010 {
HIPASEPLATFORM="win32msvc2010"
}

CONFIG(debug, debug|release) {
HIPASEPLATFORM = $$join(HIPASEPLATFORM,,"","_debug")
} else {
HIPASEPLATFORM = $$join(HIPASEPLATFORM,,"","_release")
}

DESTDIR = $$join(HIPASEPLATFORM,,"./",".bin")
OBJECTS_DIR = $$join(HIPASEPLATFORM,,"./",".obj")
MOC_DIR = $$join(HIPASEPLATFORM,,"./",".moc")
RCC_DIR = $$join(HIPASEPLATFORM,,"./",".rcc")
UI_HEADERS_DIR = $$join(HIPASEPLATFORM,,"./",".ui")
UI_SOURCES_DIR = $$join(HIPASEPLATFORM,,"./",".ui")

INCLUDEPATH += .
./common/public/include
./extern/qtitanribbon/include
../../sourcen/tool/tfr/code

LIBS += -lopengl32
-lglu32
DEPENDPATH += .

include(HipaseTool.pri)
win32:RC_FILE = HipaseTool.rc@