Hi,
I'm on step 6j of the ["Installation in Windows" -tutoria](https://docs.opencv.org/2.4/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation)l
If i try the configure command i get a failure:
C:\OpenCV\dep\qt\qt-everywhere-opensource-src-5.9.2\qtbase\configure.bat -top-level
Cannot detect host toolchain. Please use -platform. Aborting.
How can I set the toolchain? (Which toolchain?) I don't understand the message.
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