pyav==14.4.0 fails to install

[eliteprox]

See logs from uv pip install .

(pytrickle) elite@elite2:~/repos/pytrickle$ uv pip install -e .
Resolved 54 packages in 361ms
      Built pytrickle @ file:///home/elite/repos/pytrickle
  × Failed to build `av==14.4.0`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `setuptools.build_meta:__legacy__.build_wheel` failed (exit status: 1)

      [stdout]

      Warning! You are installing from source.
      It is EXPECTED that it will fail. You are REQUIRED to use ffmpeg 7.
      You MUST have Cython, pkg-config, and a C compiler.

      pkg-config could not find libraries ['avformat', 'avcodec', 'avdevice', 'avutil', 'avfilter', 'swscale', 'swresample']

      [stderr]
      Package libavdevice was not found in the pkg-config search path.
      Perhaps you should add the directory containing `libavdevice.pc'
      to the PKG_CONFIG_PATH environment variable
      Package 'libavdevice', required by 'virtual:world', not found
      Package 'libavfilter', required by 'virtual:world', not found
      Package 'libswscale', required by 'virtual:world', not found

      hint: This usually indicates a problem with the package or the build environment.
  help: `av` (v14.4.0) was included because `pytrickle` (v0.1.6.dev0+g08b375e5b.d20260115) depends on `av`

[linear]

COMFY-301