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my recomendation: Yocto project does the porting for you :smileyhappy:
Search for yocto within the community to find out how to compile a Linux Image with QT4.8 on it.
I second Leonardo advice, Yocto has a good community around it and currently most commonly used SoCs from i.MX platform is already supported by the meta-fsl-arm layer.
You can find more information how to make a build at https://community.freescale.com/docs/DOC-94023