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Well here is not quite the right place to ask about Windows builds...

You may get and download the full Qt5 bundle for Windows directly from https://qt.io -- there's no need to compile it yourself -- you may try to build qjackctl 0.6.0 from source in one of two ways:
1) - using the official autotools (./configure && make ...) provided you take the mingw/msys development environment that is deployed with Qt5 for windows last time I've checked, long time ago, I know, but probably still an option;
2) - using the non-official CMake build system, not-tested at all and last known report, it fails miserably on windows :) as always, YMMV.

hth.
cheers