Created attachment 670292 [details]
Build log of the compilation process.
If using noveau drivers, and having USE="vulkan", mpv package fails to compile.
Issue can be resolved if vulkan use flag is not used.
Has nothing to do with nouveau, vkCreateXlibSurfaceKHR (used by mpv in video/out/vulkan/context_xlib.c) is provided by media-libs/vulkan-loader[X].
Missing if built with USE=-X and leads to this failure, I guess mpv needs to explictly depend on this rather than only libplacebo.