quick n dirty notes so I don't forget
- install qt (opensource version) https://www.qt.io/download and make sure to tick msvc2017 64-bit, Sources and Qt WebEngine. just pick whatever the latest version is, even beta seems to work fine
- install python2.7 and add it to PATH. it might be necessary to also copy its executable to python2.exe https://www.python.org/downloads/windows/
- install https://sourceforge.net/projects/winflexbison/ and rename the executables to flex and bison. remember to add this to PATH
choco install -y strawberryperl gperf visualcpp-build-tools windows-sdk-10.0