why unable to build qtwebengine

Hi all ,
While i am installing Qt5.6 source package. I got the following message related to qtwebengine. I donot know why it is not installing?


cd qtwebengine/ && ( test -e Makefile || /home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtbase/bin/qmake /home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtwebengine/qtwebengine.pro -o Makefile ) && make -f Makefile install
make[1]: Entering directory `/home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtwebengine'
make[1]: Nothing to be done for `install'.
make[1]: Leaving directory `/home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtwebengine'
cd qtwebview/ && ( test -e Makefile || /home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtbase/bin/qmake /home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtwebview/qtwebview.pro -o Makefile ) && make -f Makefile install
make[1]: Entering directory `/home/ravi/Documents/qt-everywhere-opensource-src-5.6.0/qtwebview'
Some of the required modules (android|ios|winrt|osx_webview_experimental|qtHave Module(webengine)) are not available.


why it is coming. can anyone tell me?