Qt 4.8 missing toolchain for mingw

I work with qt since 5 years and so far with all versions of qtcreator and never had a problem.
Now I installed SDK 1.2 with latest QtCreator after have not been using Qt and C++ for a year and it complains about a missing toolchain for mingw.

Can somebody please tell me what toolchains are and why there is nothing found for mingw??
Is mingw no longer supported on windows? Currently do not consider to use msvc because it
is a nightmare in deployment.

Open the maintenance tool from within Creator and see if you have a checkbox next to MinGW toolchains for your platform.

Quote:

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Originally Posted by wysota

Open the maintenance tool from within Creator ...

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I have no idea what the "maintenance tool" is. At least I can not find anything in Creator of that name.

Menu Help -> Start Updater or run SDKMaintenanceTool from the command line.

The mingw compiler was not installed. But I do not understand why it was not auto selected ...