buildLicenseFlavour

The FFmpeg licence flavour this artifact was built for, lgpl or gpl.

Compare it with runtimeLicense. They can disagree, and on a developer machine with a Homebrew FFmpeg they routinely do: the build declares LGPL and the runtime answers "GPL version 3 or later". KiteFFmpeg reports the pair rather than deciding what it means, because which licence obligations a shipped application takes on is a distribution question and not an ABI one.