maintainer-feedback requested: [Bug 267237] multimedia/gstreamer1-libav: build failure (poudriere, FBSD 13.1-RELENG)

Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-multimedia
(Nobody) <multimedia@FreeBSD.org> for maintainer-feedback:
Bug 267237: multimedia/gstreamer1-libav: build failure (poudriere, FBSD
13.1-RELENG)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267237



--- Description ---
The port repeatedly fails to build in both make and poudriere environemnt,
provided is the failure report from poudriere. For the poudriere environemnt,
please see PR 267235

[...]
C compiler for the host machine: cc (clang 13.0.0 "FreeBSD clang version 13.0.0
(git@github.com:llvm/llvm-project.git llvmorg-13.0.0-0-gd7b669b3a303)")
C linker for the host machine: cc ld.lld 13.0.0
Host machine cpu family: x86_64
Host machine cpu: x86_64
Found pkg-config: /usr/local/bin/pkgconf (1.8.0)
Did not find CMake 'cmake'
Found CMake: NO
Run-time dependency libavfilter found: NO (tried pkgconfig and cmake)
Looking for a fallback subproject for the dependency libavfilter

meson.build:21:0: ERROR: Neither a subproject directory nor a FFmpeg.wrap file
was found.

A full log can be found at
/wrkdirs/usr/ports/multimedia/gstreamer1-libav/work/gst-libav-1.20.3/_build/mes
on-logs/meson-log.txt
===>  Script "configure" failed unexpectedly.
Please report the problem to multimedia@FreeBSD.org [maintainer] and attach
the
"/wrkdirs/usr/ports/multimedia/gstreamer1-libav/work/gst-libav-1.20.3/_build/me
son-logs/meson-log.txt"
including the output of the failure of your make command. Also, it might be
a good idea to provide an overview of all packages installed on your system
(e.g. a /usr/local/sbin/pkg-static info -g -Ea).
*** Error code 1

Stop.
make: stopped in /usr/ports/multimedia/gstreamer1-libav
=>> Cleaning up wrkdir
===>  Cleaning for gstreamer1-libav-1.20.3
build of multimedia/gstreamer1-libav | gstreamer1-libav-1.20.3 ended at Fri Oct
21 06:09:05 UTC 2022
build time: 00:00:09
!!! build failure encountered !!!