Trying to use multiple Debian repositories

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http://unix.stackexchange.com – I shall briefly describe my issue: General situation: I need to port Qt project from MS Visual Studio 2010 to Linux (Debian) In VS 2010 I got Qt ver. 4.8.1 in Debian Qt 4.6.1 this difference prevents me from porting, as some features are not present in 4.6.1. In Debian I use stable Squeeze repository. My expirience with this OS and especially Linux == 0. Issue: As in the Squeeze repository, the highest availiable version of Qt is 4.6.1, I decided to use multiple repositories (wheezy) and get the needed package from wheezy. To add wheezy I did the following actions: Edited /etc/apt/sour (HowTos)