Gentoo's Bugzilla –
Attachment 766105 Details for
Bug 834425dev-games/openscenegraph-openmw-3.6_p20211017-r1 with ffmpeg-5.0: src/osgPlugins/ffmpeg/FFmpegPacket.hpp:45:17: error: ‘av_free_packet’ was not declared in this scope; did you mean ‘av_new_packet’?