I am using Qt 5.3.2 MSVC2010 OpenGL 32bit, and I downloaded and installed a library called PCL, that you can use from a pre-built all-in one package that contains already built libraries of all its dependencies (all compiled with MSVC2010).
One of those dependencies, VTK, used for visualization doesn't seem to find its own libraries even if I added all of them in my .pro file, that looks like this:

@QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = PCLTestVisualizer
TEMPLATE = app

SOURCES += main.cpp
pclviewer.cpp

HEADERS += pclviewer.h

FORMS += pclviewer.ui

INCLUDEPATH += C:\pcl32\include\pcl-1.6
INCLUDEPATH += C:\pcl32\3rdParty\Boost\include
INCLUDEPATH += C:\pcl32\3rdParty\Eigen\include
INCLUDEPATH += C:\pcl32\3rdParty\FLANN\include
INCLUDEPATH += C:\pcl32\3rdParty\Qhull\include
INCLUDEPATH += C:\pcl32\3rdParty\VTK\include\vtk-5.8

LIBS += -LC:\pcl32\3rdParty\Qhull\Lib
-lqhullstatic

LIBS += -LC:\pcl32\lib
-lpcl_apps_release
-lpcl_common_release
-lpcl_features_release
-lpcl_filters_release
-lpcl_io_release
-lpcl_io_ply_release
-lpcl_kdtree_release
-lpcl_keypoints_release
-lpcl_octree_release
#-lpcl_range_image_border_extractor_release
-lpcl_registration_release
-lpcl_sample_consensus_release
-lpcl_search_release
-lpcl_segmentation_release
-lpcl_surface_release
-lpcl_tracking_release
-lpcl_visualization_release

LIBS += -LC:\pcl32\3rdParty\VTK\lib\vtk-5.8
-lMapReduceMPI
-lmpistubs
-lQVTK
-lvtkalglib
-lvtkCharts
-lvtkCommon
-lvtkDICOMParser
-lvtkexoIIc
-lvtkexpat
-lvtkFiltering
-lvtkfreetype
-lvtkftgl
-lvtkGenericFiltering
-lvtkGeovis
-lvtkGraphics
-lvtkhdf5
-lvtkHybrid
-lvtkImaging
-lvtkInfovis
-lvtkIO
-lvtkjpeg
-lvtklibxml2
-lvtkmetaio
-lvtkNetCDF
-lvtkNetCDF_cxx
-lvtkpng
-lvtkproj4
-lvtkRendering
-lvtksqlite
-lvtksys
-lvtktiff
-lvtkverdict
-lvtkViews
-lvtkVolumeRendering
-lvtkWidgets
-lvtkzlib

LIBS += -LC:\pcl32\3rdParty\FLANN\lib
-lflann_cpp_s

LIBS += -LC:\pcl32\3rdParty\Boost\lib
-llibboost_date_time-vc100-mt-1_49
-llibboost_thread-vc100-mt-1_49
-llibboost_filesystem-vc100-mt-1_49
-llibboost_system-vc100-mt-1_49
-llibboost_iostreams-vc100-mt-1_49@

I get 28 unresolved external from the linker:

@link /NOLOGO /DYNAMICBASE /NXCOMPAT /INCREMENTAL:NO /SUBSYSTEM:WINDOWS "/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST /MANIFESTFILE:release\PCLTestVisualizer.exe.embed.manifest /OUT:release\PCLTestVisualizer.exe @C:\Users\Michele\AppData\Local\Temp\PCLTestVisualizer.exe.1308.16926.jom
QVTK.lib(QVTKWidget.obj) : error LNK2001: unresolved external symbol "protected: virtual void __thiscall QObject::connectNotify(char const *)" (?connectNotify@QObject@@MAEXPBD@Z)
QVTK.lib(QVTKInteractorAdapter.obj) : error LNK2001: unresolved external symbol "protected: virtual void __thiscall QObject::connectNotify(char const *)" (?connectNotify@QObject@@MAEXPBD@Z)
QVTK.lib(QVTKInteractor.obj) : error LNK2001: unresolved external symbol "protected: virtual void __thiscall QObject::connectNotify(char const *)" (?connectNotify@QObject@@MAEXPBD@Z)

[CUT....]

vtksys.lib(SystemTools.obj) : error LNK2019: unresolved external symbol __imp__RegCloseKey@4 referenced in function "public: static bool __cdecl vtksys::SystemTools::ReadRegistryValue(char const *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &,enum vtksys::SystemTools::KeyWOW64)" (?ReadRegistryValue@SystemTools@vtksys@@SA_NPBDAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@W4KeyWOW64@12@@Z)

[CUT....]

(?ReadRegistryValue@SystemTools@vtksys@@SA_NPBDAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@W4KeyWOW64@12@@Z)
jom: C:\Qt\projects\build-PCLTestVisualizer-Desktop_Qt_5_3_MSVC2010_OpenGL_32bit-Release\Makefile.Release [release\PCLTestVisualizer.exe] Error 1120
vtksys.lib(SystemTools.obj) : error LNK2019: unresolved external symbol __imp__RegOpenKeyExA@20 referenced in function "public: static bool __cdecl vtksys::SystemTools::ReadRegistryValue(char const *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &,enum vtksys::SystemTools::KeyWOW64)" (?ReadRegistryValue@SystemTools@vtksys@@SA_NPBDAAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@W4KeyWOW64@12@@Z)
vtksys.lib(SystemTools.obj) : error LNK2019: unresolved external symbol __imp__RegSetValueExA@24 referenced in function "public: static bool __cdecl vtksys::SystemTools::WriteRegistryValue(char const *,char const *,enum vtksys::SystemTools::KeyWOW64)" (?WriteRegistryValue@SystemTools@vtksys@@SA_NPBD0W4KeyWOW64@12@@Z)
vtksys.lib(SystemTools.obj) : error LNK2019: unresolved external symbol __imp__RegCreateKeyExA@36 referenced in function "public: static bool __cdecl vtksys::SystemTools::WriteRegistryValue(char const *,char const *,enum vtksys::SystemTools::KeyWOW64)" (?WriteRegistryValue@SystemTools@vtksys@@SA_NPBD0W4KeyWOW64@12@@Z)
vtksys.lib(SystemTools.obj) : error LNK2019: unresolved external symbol __imp__RegDeleteValueA@8 referenced in function "public: static bool __cdecl vtksys::SystemTools::DeleteRegistryValue(char const *,enum vtksys::SystemTools::KeyWOW64)" (?DeleteRegistryValue@SystemTools@vtksys@@SA_NPBDW4KeyWOW64@12@@Z)@

Moreover, every .dll and .lib file related to VTK are now in my PATH variable as well. But I still got always the same results. What I am supposed to do? Am I doing something wrong with .pro file?
Thanks in advance for your answers.