Webengine Widgets Client Certificate Example: Compilation Fails

14:28:03: Running steps for project clientcertificate...
14:28:03: Configuration unchanged, skipping qmake step.
14:28:03: Starting: "/usr/bin/make" -j8
( test -e Makefile.client || /home/anurup/Qt/6.2.8/gcc_64/bin/qmake -o Makefile.client /home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/clientcertificate/client.pro -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug ) && /usr/bin/make -f Makefile.client 
( test -e Makefile.server || /home/anurup/Qt/6.2.8/gcc_64/bin/qmake -o Makefile.server /home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/clientcertificate/server.pro -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug ) && /usr/bin/make -f Makefile.server 
make[1]: Entering directory '/home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/build-clientcertificate-Desktop_Qt_6_2_8_GCC_64bit-Debug'
g++ -c -pipe -g -std=gnu++1z -Wall -Wextra -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../clientcertificate -I. -I../../../../6.2.8/gcc_64/include -I../../../../6.2.8/gcc_64/include/QtGui -I../../../../6.2.8/gcc_64/include/QtNetwork -I../../../../6.2.8/gcc_64/include/QtCore -I. -I../../../../6.2.8/gcc_64/mkspecs/linux-g++ -o server.o ../clientcertificate/server.cpp
make[1]: Entering directory '/home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/build-clientcertificate-Desktop_Qt_6_2_8_GCC_64bit-Debug'
make[1]: Nothing to be done for 'first'.
make[1]: Leaving directory '/home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/build-clientcertificate-Desktop_Qt_6_2_8_GCC_64bit-Debug'
../clientcertificate/server.cpp:10:10: fatal error: QtNetwork/qsslserver.h: No such file or directory
   10 | #include <QtNetwork/qsslserver.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[1]: Leaving directory '/home/anurup/Qt/Examples/Qt-6.2.8/webenginewidgets/build-clientcertificate-Desktop_Qt_6_2_8_GCC_64bit-Debug'
make[1]: *** [Makefile.server:1054: server.o] Error 1
make: *** [Makefile:62: sub-server-pro-make_first] Error 2
14:28:03: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project clientcertificate (kit: Desktop Qt 6.2.8 GCC 64bit)
When executing step "Make"
14:28:03: Elapsed time: 00:00.