Please add -no-install-phonon to build phonon but not install libs and headers to system - qt phonon headers and lib breaks kde4 build and other apps build. qt phonon libs and headers appears first to compiler and kde phonon is not used. Qt this way only do harm to source based Linux distros. By doing by hand these commands after qt2 installation:
rm -rf /usr/include/qt4/phonon
rm -f /usr/lib/qt4/libphonon.so*
this workarounds these build problem in ugly way.
I know about -no-phonon switch - this is no option for me because webkit is not built without phonon.

I tried to fix qt build scripts to build phonon but not install it to system:
sed -i '/install(/d' src/3rdparty/phonon/qt7/CMakeLists.txt
sed -i '/install(/d' src/3rdparty/phonon/gstreamer/CMakeLists.txt
true > src/3rdparty/phonon/includes/CMakeLists.txt
sed -i '/install(/d' src/3rdparty/phonon/phonon/CMakeLists.txt
sed -i '/\.h$/d' src/3rdparty/phonon/phonon/CMakeLists.txt
sed -i '/DESTINATION/d' src/3rdparty/phonon/phonon/CMakeLists.txt
sed -i '/install(/d' src/3rdparty/phonon/CMakeLists.txt
No luck. Even with all these install options cut from CMakeLists.txt qt installer in some evil way still installs phonon to system.

Please tell me how to patch qt-4.7.2 sources so it will build phonon for Qt's builder internal needs (like webkit build) but will not install it to system.