[Qgis-developer] Error using QGIS API (unresolved external symbol "public: static struct, QMetaObject const QgsVectorLayer::staticMetaObject")

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Hi,

I am building a custom application use QGIS 1.8.0 but I get the 
following error:

/        link /LIBPATH:"c:\Qt\4.8.1\lib" /NOLOGO /DYNAMICBASE /NXCOMPAT 
/DEBUG /M
ANIFEST /MANIFESTFILE:"debug\nile.intermediate.manifest" 
/SUBSYSTEM:WINDOWS "/MA
NIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' 
version='
6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*' 
processorArchitecture='*
'" /OUT:debug\nile.exe @C:\DOCUME~1\CARLOS~1\LOCALS~1\Temp\nmF.tmp
mapwidget.obj : error LNK2001: unresolved external symbol "public: 
static struct
  QMetaObject const QgsVectorLayer::staticMetaObject" 
(?staticMetaObject at QgsVecto
rLayer@@2UQMetaObject@@B)
maptoolselect.obj : error LNK2001: unresolved external symbol "public: 
static st
ruct QMetaObject const QgsVectorLayer::staticMetaObject" 
(?staticMetaObject at QgsV
ectorLayer@@2UQMetaObject@@B)
mapwidget.obj : error LNK2001: unresolved external symbol "public: 
static struct
  QMetaObject const QgsRasterLayer::staticMetaObject" 
(?staticMetaObject at QgsRaste
rLayer@@2UQMetaObject@@B)
debug\nile.exe : fatal error LNK1120: 2 unresolved externals
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio 
10.0\VC\BI
N\link.EXE"' : return code '0x460'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files\Microsoft Visual Studio 
10.0\VC\BI
N\nmake.exe"' : return code '0x2'
Stop./

My .pro file is defined as:

/QT       += core gui sql xml

TARGET = nile
TEMPLATE = app

unix:INCLUDEPATH += /usr/local/gis/include/qgis /usr/local/gis/include 
./mapviewsrc
win32:INCLUDEPATH += C:/QGIS/apps/qgis/include C:/QGIS/include ./mapviewsrc

unix:LIBS += -L/usr/local/gis/lib -lgdal -lgeos -lqgis_core -lqgis_gui
win32:LIBS += C:/QGIS/apps/qgis/lib/qgis_core.lib 
C:/QGIS/apps/qgis/lib/qgis_gui.lib C:/QGIS/lib/geos_c_i.lib 
C:/QGIS/lib/gdal_i.lib


DEFINES += QGISPLUGINDIR=$${QGISPLUGINDIR} CORE_EXPORT= GUI_EXPORT=/

I am using QT 4.8.1 and Visual Studio 2010.

Any idea what is causing the error and how to correct it?

Many thanks in advance,
Carlos


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