Why does cargo-web download emscripten and binaryen even though I have them installed?

[svenstaro]

Basically see title. I'm using Arch Linux and have emscripten and binaryen installed and working using provided packages but cargo-web still tries to download these. Can't it use system packages?

[koute]

It can, if you pass it the --use-system-emscripten flag. By default it always downloads Emscripten for consistency's sake across multiple distributions.

I would definitely be willing to add a feature flag which would flip this default to be the other way around.

[svenstaro]

Thank you, I didn't see that flag!