QT4 build debian/ubuntu package 4.2

[patrik08]

I have installed qt4-dev-tools (4.0.0-3ubuntu1) on my ubuntu linux (like debian sarge)
but is file orig. qt4-x11_4.0.0.orig.tar.gz and i like to build 4.2 .... how i can make this?

I say only make a source build from existing package....

apt-get source qt4-dev-tools
apt-get install fakeroot
 
apt-get build-dep qt4-dev-tools
dpkg-buildpackage -rfakeroot -uc -b

apt-get source qt4-dev-tools
apt-get install fakeroot

apt-get build-dep qt4-dev-tools
dpkg-buildpackage -rfakeroot -uc -b

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How i make the same action on version qt-x11-opensource-src-4.2.0-rc1.tar.gz