The compilation of conf-ffmpeg.1 failed at "pkg-config --exists libavutil libavformat libavcodec libavdevice libavfilter libswresample libswscale".

[spjoes]

Hello! Anytime I try to install ffmpeg through opam, I get The compilation of conf-ffmpeg.1 failed at "pkg-config --exists libavutil libavformat libavcodec libavdevice libavfilter libswresample libswscale".

Full Error:

> opam install -y .

[ffmpeg-av.1.2.0] synchronised (no changes)
[ffmpeg-avcodec.1.2.0] synchronised (no changes)
[ffmpeg.1.2.0] synchronised (no changes)
[ffmpeg-avdevice.1.2.0] synchronised (no changes)
[ffmpeg-avfilter.1.2.0] synchronised (no changes)
[ffmpeg-avutil.1.2.0] synchronised (no changes)
[ffmpeg-swresample.1.2.0] synchronised (no changes)
[ffmpeg-swscale.1.2.0] synchronised (no changes)
The following actions will be performed:
=== install 9 packages
  ∗ conf-ffmpeg       1              [required by ffmpeg-swresample, ffmpeg-avfilter, ffmpeg-avcodec, etc.]
  ∗ ffmpeg            1.2.0 (pinned)
  ∗ ffmpeg-av         1.2.0 (pinned)
  ∗ ffmpeg-avcodec    1.2.0 (pinned)
  ∗ ffmpeg-avdevice   1.2.0 (pinned)
  ∗ ffmpeg-avfilter   1.2.0 (pinned)
  ∗ ffmpeg-avutil     1.2.0 (pinned)
  ∗ ffmpeg-swresample 1.2.0 (pinned)
  ∗ ffmpeg-swscale    1.2.0 (pinned)

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
[ERROR] The compilation of conf-ffmpeg.1 failed at "pkg-config --exists libavutil libavformat libavcodec libavdevice libavfilter libswresample libswscale".

#=== ERROR while compiling conf-ffmpeg.1 ======================================#
# context     2.2.0 | linux/arm64 | ocaml.5.2.0 | https://opam.ocaml.org#13acffc3de9c22953d1e08bad3e56ee6e965eeed
# path        ~/.opam/default/.opam-switch/build/conf-ffmpeg.1
# command     ~/.opam/opam-init/hooks/sandbox.sh build pkg-config --exists libavutil libavformat libavcodec libavdevice libavfilter libswresample libswscale
# exit-code   1
# env-file    ~/.opam/log/conf-ffmpeg-88019-6c7efd.env
# output-file ~/.opam/log/conf-ffmpeg-88019-6c7efd.out



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
┌─ The following actions failed
│ λ build conf-ffmpeg 1
└─
╶─ No changes have been performed

I have no idea whats wrong as "pkg-config" works and "pkg-config --exists libavutil libavformat libavcodec libavdevice libavfilter libswresample libswscale" even works when running it myself. This is the only issue. Other packages install fine with opam.

Im running an arm machine with "Oracle Linux 8"