Location of d3dcompiler_47.dll
I've built Qt 5.10.1 from source with ANGLE.
"If ANGLE is used in your application, you should normally ship d3dcompiler_XX.dll along with the Qt libraries"
This file won't be compiled with the build.
I assume it's located in the Windows SDK folder. My problem is to identify which one is needed, because I have several SDKs installed and vcvarsall isn't using any kind of SDK.
Inspect your Qt build with dependency walker (or however the tool was called) to see against which library Qt was linked. That'd give you the answer which one of the dlls you need to ship.