Which ndk is ideal for 4.5.2?

For anyone who knows about the android sdks – which android NDK goes with OpenCV 4.5.2 for library compilation purposes? 21d is no longer listed on the downloads page. I tried to match it with 21e, but ran into a bunch of gnu c++ compiler issues (gnu c++ was removed after ndk 17).

I was able to successfully compile OpenCV 4.0.1 into an .so using almost the exact same process in Visual Studio (the only difference being the include, library locations, and ndk – and I know the first two of those are linking up properly).

Cmake also tells me that the toolchain for r21e isn’t valid and “probably your NDK is broken”

All old versions are avaiable on Unsupported NDK Downloads page

Those begin with 20b and earlier.