Advice please on installing QT5 on Ubuntu 12.04

[dragonfly41]

Is there fast track for installing QT5 on Ubuntu 12.04?

I did find this ... http://qt-project.org/wiki/Building-Qt-5-from-Git

but I would like to use a simpler PPA command if possible.

I already have QT 4.8.1 installed.

I need QT5 for building cmake-2.8.10.2-Linux-i386

cmake-2.8.10.2 in turn is needed to build some packages.

This is the error message I see when trying to build a package.

CMake Error at CMakeLists.txt:415 (FIND_PACKAGE):
By not providing "FindQt5Core.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5Core", but
CMake did not find one.

So .. back to installing QT5.

===========================================

[Later Edit]

I found this article ..
http://www.ubuntuask.com/q/answers-how-can-i-install-qt-5-x-on-12-04-lts-279421.html

sudo apt-add-repository ppa:ubuntu-sdk-team/ppa
sudo apt-get update
sudo apt-get install qtdeclarative5-dev

And then download

Qt 5.1.1 for Linux 32-bit (417 MB)

Make the downloaded file (with *.run extension) executable

Then run as executable installer.

Qt 5.1.1 installed in /opt/Qt5.1.1

...

I have to yet to complete the build of cmake-2.8.10.2 but since I've now got Qt Creator 5.1.1 installed I should be nearly home and dry.