webpage.cpp:77:39: error: invalid use of incomplete type ‘class TestNamespace::QStyle’

g++ -c -pipe -g -Og -std=gnu++11 -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser -I. -I../../../include -I../../../include/QtWebEngineWidgets -I../../../include/QtWebEngineCore -I/home/qt/work/install/include -I/home/qt/work/install/include/QtQuick -I/home/qt/work/install/include/QtPrintSupport -I/home/qt/work/install/include/QtWidgets -I/home/qt/work/install/include/QtGui -I/home/qt/work/install/include/QtWebChannel -I/home/qt/work/install/include/QtQml -I/home/qt/work/install/include/QtNetwork -I/home/qt/work/install/include/QtPositioning -I/home/qt/work/install/include/QtCore -I.moc -isystem /usr/include/libdrm -I.uic -I/home/qt/work/install/mkspecs/linux-g++ -o .obj/moc_downloadmanagerwidget.o .moc/moc_downloadmanagerwidget.cpp
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp: In member function ‘virtual bool WebPage::certificateError(const TestNamespace::QWebEngineCertificateError&)’:
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:77:39: error: invalid use of incomplete type ‘class TestNamespace::QStyle’
         QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, mainWindow));
                                       ^
In file included from /home/qt/work/install/include/QtWidgets/qmainwindow.h:44:0,
                 from /home/qt/work/install/include/QtWidgets/QMainWindow:1,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/browserwindow.h:54,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:51:
/home/qt/work/install/include/QtWidgets/qwidget.h:67:7: note: forward declaration of ‘class TestNamespace::QStyle’
 class QStyle;
       ^
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:77:54: error: incomplete type ‘TestNamespace::QStyle’ used in nested name specifier
         QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, mainWindow));
                                                      ^
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp: In member function ‘void WebPage::handleAuthenticationRequired(const TestNamespace::QUrl&, TestNamespace::QAuthenticator*)’:
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:99:35: error: invalid use of incomplete type ‘class TestNamespace::QStyle’
     QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxQuestion, 0, mainWindow));
                                   ^
In file included from /home/qt/work/install/include/QtWidgets/qmainwindow.h:44:0,
                 from /home/qt/work/install/include/QtWidgets/QMainWindow:1,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/browserwindow.h:54,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:51:
/home/qt/work/install/include/QtWidgets/qwidget.h:67:7: note: forward declaration of ‘class TestNamespace::QStyle’
 class QStyle;
       ^
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:99:50: error: incomplete type ‘TestNamespace::QStyle’ used in nested name specifier
     QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxQuestion, 0, mainWindow));
                                                  ^
g++ -c -pipe -g -Og -std=gnu++11 -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser -I. -I../../../include -I../../../include/QtWebEngineWidgets -I../../../include/QtWebEngineCore -I/home/qt/work/install/include -I/home/qt/work/install/include/QtQuick -I/home/qt/work/install/include/QtPrintSupport -I/home/qt/work/install/include/QtWidgets -I/home/qt/work/install/include/QtGui -I/home/qt/work/install/include/QtWebChannel -I/home/qt/work/install/include/QtQml -I/home/qt/work/install/include/QtNetwork -I/home/qt/work/install/include/QtPositioning -I/home/qt/work/install/include/QtCore -I.moc -isystem /usr/include/libdrm -I.uic -I/home/qt/work/install/mkspecs/linux-g++ -o .obj/moc_downloadwidget.o .moc/moc_downloadwidget.cpp
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp: In member function ‘void WebPage::handleProxyAuthenticationRequired(const TestNamespace::QUrl&, TestNamespace::QAuthenticator*, const TestNamespace::QString&)’:
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:127:35: error: invalid use of incomplete type ‘class TestNamespace::QStyle’
     QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxQuestion, 0, mainWindow));
                                   ^
In file included from /home/qt/work/install/include/QtWidgets/qmainwindow.h:44:0,
                 from /home/qt/work/install/include/QtWidgets/QMainWindow:1,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/browserwindow.h:54,
                 from /home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:51:
/home/qt/work/install/include/QtWidgets/qwidget.h:67:7: note: forward declaration of ‘class TestNamespace::QStyle’
 class QStyle;
       ^
/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser/webpage.cpp:127:50: error: incomplete type ‘TestNamespace::QStyle’ used in nested name specifier
     QIcon icon(mainWindow->style()->standardIcon(QStyle::SP_MessageBoxQuestion, 0, mainWindow));
                                                  ^
g++ -c -pipe -g -Og -std=gnu++11 -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser -I. -I../../../include -I../../../include/QtWebEngineWidgets -I../../../include/QtWebEngineCore -I/home/qt/work/install/include -I/home/qt/work/install/include/QtQuick -I/home/qt/work/install/include/QtPrintSupport -I/home/qt/work/install/include/QtWidgets -I/home/qt/work/install/include/QtGui -I/home/qt/work/install/include/QtWebChannel -I/home/qt/work/install/include/QtQml -I/home/qt/work/install/include/QtNetwork -I/home/qt/work/install/include/QtPositioning -I/home/qt/work/install/include/QtCore -I.moc -isystem /usr/include/libdrm -I.uic -I/home/qt/work/install/mkspecs/linux-g++ -o .obj/moc_tabwidget.o .moc/moc_tabwidget.cpp
g++ -c -pipe -g -Og -std=gnu++11 -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser -I. -I../../../include -I../../../include/QtWebEngineWidgets -I../../../include/QtWebEngineCore -I/home/qt/work/install/include -I/home/qt/work/install/include/QtQuick -I/home/qt/work/install/include/QtPrintSupport -I/home/qt/work/install/include/QtWidgets -I/home/qt/work/install/include/QtGui -I/home/qt/work/install/include/QtWebChannel -I/home/qt/work/install/include/QtQml -I/home/qt/work/install/include/QtNetwork -I/home/qt/work/install/include/QtPositioning -I/home/qt/work/install/include/QtCore -I.moc -isystem /usr/include/libdrm -I.uic -I/home/qt/work/install/mkspecs/linux-g++ -o .obj/moc_webpage.o .moc/moc_webpage.cpp
g++ -c -pipe -g -Og -std=gnu++11 -fno-exceptions -Wall -W -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -I/home/qt/work/qt/qtwebengine/examples/webenginewidgets/simplebrowser -I. -I../../../include -I../../../include/QtWebEngineWidgets -I../../../include/QtWebEngineCore -I/home/qt/work/install/include -I/home/qt/work/install/include/QtQuick -I/home/qt/work/install/include/QtPrintSupport -I/home/qt/work/install/include/QtWidgets -I/home/qt/work/install/include/QtGui -I/home/qt/work/install/include/QtWebChannel -I/home/qt/work/install/include/QtQml -I/home/qt/work/install/include/QtNetwork -I/home/qt/work/install/include/QtPositioning -I/home/qt/work/install/include/QtCore -I.moc -isystem /usr/include/libdrm -I.uic -I/home/qt/work/install/mkspecs/linux-g++ -o .obj/moc_webpopupwindow.o .moc/moc_webpopupwindow.cpp
Makefile:2641: recipe for target '.obj/webpage.o' failed
make[3]: *** [.obj/webpage.o] Error 1
make[3]: *** Waiting for unfinished jobs....
g++ -fuse-ld=gold -Wl,--enable-new-dtags -Wl,--gdb-index -Wl,-z,origin -Wl,-rpath,\$ORIGIN/../../../lib -Wl,-rpath,\$ORIGIN/../../../lib -Wl,-rpath-link,/home/qt/work/build/lib -Wl,-rpath-link,/home/qt/work/install/lib -o videoplayer .obj/main.o .obj/mainwindow.o .obj/fullscreenwindow.o .obj/fullscreennotification.o .obj/qrc_videoplayer.o .obj/moc_mainwindow.o .obj/moc_fullscreenwindow.o .obj/moc_fullscreennotification.o   -L/home/qt/work/build/lib -lQt5WebEngineWidgetsTestInfix -L/home/qt/work/install/lib -lQt5WebEngineCoreTestInfix -lQt5QuickTestInfix -lQt5PrintSupportTestInfix -lQt5WidgetsTestInfix -lQt5GuiTestInfix -lQt5WebChannelTestInfix -lQt5QmlTestInfix -lQt5NetworkTestInfix -lQt5PositioningTestInfix -lQt5CoreTestInfix -lGL -lpthread 
make[3]: Leaving directory '/home/qt/work/build/examples/webenginewidgets/videoplayer'
make[3]: Leaving directory '/home/qt/work/build/examples/webenginewidgets/simplebrowser'
Makefile:178: recipe for target 'sub-simplebrowser-make_first' failed
make[2]: *** [sub-simplebrowser-make_first] Error 2
make[2]: *** Waiting for unfinished jobs....
g++ -fuse-ld=gold -Wl,--enable-new-dtags -Wl,--gdb-index -Wl,-z,origin -Wl,-rpath,\$ORIGIN/../../../lib -Wl,-rpath,\$ORIGIN/../../../lib -Wl,-rpath-link,/home/qt/work/build/lib -Wl,-rpath-link,/home/qt/work/install/lib -o contentmanipulation .obj/main.o .obj/mainwindow.o .obj/qrc_jquery.o .obj/moc_mainwindow.o   -L/home/qt/work/build/lib -lQt5WebEngineWidgetsTestInfix -L/home/qt/work/install/lib -lQt5WebEngineCoreTestInfix -lQt5QuickTestInfix -lQt5PrintSupportTestInfix -lQt5WidgetsTestInfix -lQt5GuiTestInfix -lQt5WebChannelTestInfix -lQt5QmlTestInfix -lQt5NetworkTestInfix -lQt5PositioningTestInfix -lQt5CoreTestInfix -lGL -lpthread 
make[3]: Leaving directory '/home/qt/work/build/examples/webenginewidgets/contentmanipulation'
make[2]: Leaving directory '/home/qt/work/build/examples/webenginewidgets'
Makefile:70: recipe for target 'sub-webenginewidgets-make_first' failed
make[1]: *** [sub-webenginewidgets-make_first] Error 2
make[1]: Leaving directory '/home/qt/work/build/examples'
Makefile:71: recipe for target 'sub-examples-make_first' failed
make: *** [sub-examples-make_first] Error 2

	cl -c -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -O2 -MD -utf-8 /wd4530 /wd4577 -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -DUNICODE -D_UNICODE -DWIN32 -DWIN64 -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_WEBENGINEWIDGETS_LIB -DQT_WEBENGINECORE_LIB -DQT_QUICK_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_WEBCHANNEL_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_POSITIONING_LIB -DQT_CORE_LIB -DQT_NAMESPACE=TestNamespace -DNDEBUG -I. -I..\..\..\include -I..\..\..\include\QtWebEngineWidgets -I..\..\..\include\QtWebEngineCore -Ic:\Users\qt\work\install\include -Ic:\Users\qt\work\install\include\QtQuick -Ic:\Users\qt\work\install\include\QtPrintSupport -Ic:\Users\qt\work\install\include\QtWidgets -Ic:\Users\qt\work\install\include\QtGui -Ic:\Users\qt\work\install\include\QtANGLE -Ic:\Users\qt\work\install\include\QtWebChannel -Ic:\Users\qt\work\install\include\QtQml -Ic:\Users\qt\work\install\include\QtNetwork -Ic:\Users\qt\work\install\include\QtPositioning -Ic:\Users\qt\work\install\include\QtCore -I.moc\release -I.uic -IC:\VulkanSDK\1.0.51.0\include -IC:\utils\my_sql\my_sql\include -IC:\utils\postgresql\pgsql\include -Ic:\Users\qt\work\install\mkspecs\win32-msvc -Fo.obj\release\ @C:\Users\qt\AppData\Local\Temp\nmA6FC.tmp
browser.cpp
browserwindow.cpp
downloadmanagerwidget.cpp
downloadwidget.cpp
main.cpp
tabwidget.cpp
webpage.cpp
.\webpage.cpp(77): error C2027: use of undefined type 'TestNamespace::QStyle'
c:\users\qt\work\install\include\qtwidgets\qapplication.h(58): note: see declaration of 'TestNamespace::QStyle'
.\webpage.cpp(77): error C2227: left of '->standardIcon' must point to class/struct/union/generic type
.\webpage.cpp(77): error C2065: 'SP_MessageBoxWarning': undeclared identifier
.\webpage.cpp(99): error C2027: use of undefined type 'TestNamespace::QStyle'
c:\users\qt\work\install\include\qtwidgets\qapplication.h(58): note: see declaration of 'TestNamespace::QStyle'
.\webpage.cpp(99): error C2227: left of '->standardIcon' must point to class/struct/union/generic type
.\webpage.cpp(99): error C2065: 'SP_MessageBoxQuestion': undeclared identifier
.\webpage.cpp(127): error C2027: use of undefined type 'TestNamespace::QStyle'
c:\users\qt\work\install\include\qtwidgets\qapplication.h(58): note: see declaration of 'TestNamespace::QStyle'
.\webpage.cpp(127): error C2227: left of '->standardIcon' must point to class/struct/union/generic type
.\webpage.cpp(127): error C2065: 'SP_MessageBoxQuestion': undeclared identifier
webpopupwindow.cpp
webview.cpp
Generating Code...
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\cl.EXE"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.