The culprit to your problem is `rust-ffmpeg-sys-the-third-1', which
requires all the packages you just mentioned for building.
`rust-av1an-core` requires `rust-ffmpeg-the-third-1' which in turn
requires the sys libraries as well.
--8<---------------cut here---------------start------------->8---
rust-ffmpeg-sys-the-third-1 -> Requires vapoursynth ffmpeg clang nasm
pkg-config
rust-ffmpeg-the-third-1 -> Requires rust-ffmpeg-sys-the-third-1
rust-av1an-core -> Requires rust-ffmpeg-the-third-1
rust-av1an -> Requires rust-av1an-core
--8<---------------cut here---------------end--------------->8---
Thus, the native-inputs and inputs of rust-ffmpeg-sys-the-third are
required for any packages that depend on it in #:cargo-inputs.
I see your point now, it would be very helpful if cargo-build-system
could grab the inputs and native-inputs of dependent packages in the
case of crates like `rust-ffmpeg-sys-the-third-1.' That way the
dependencies wouldn't have to be duplicated across packages.
This sounds like a good suggestion, I can bring this up to Efraim, who
is on the Rust team, about this who is much more knowledgeable about the
implementation of the cargo-build-system than me.
--
Jaeme
