[FFmpeg-user] configure gives "ERROR: libzmq >= 4.2.1 not found using pkg-config"

[Moritz Barsnick]

On Wed, Feb 23, 2022 at 17:16:43 +0100, Reindl Harald wrote:
> Am 23.02.22 um 12:24 schrieb Thomas Seilund via ffmpeg-user:
> > libzmq3-dev/stable,now 4.3.4-1 arm64 [installed]
> > libzmq5/stable,now 4.3.4-1 arm64 [installed,automatic]
>
> libzmq5 is *not* the dev-package

But the quoted libzmq3-dev is. It's apparently installed, and it should
include the required pkg-config file:

https://packages.debian.org/bullseye/arm64/libzmq3-dev/filelist

Thomas, you will need to should us the relevant section of ffbuild/config.log.
That section begins something like this:

> require_pkg_config libzmq libzmq >= 4.2.1 zmq.h zmq_ctx_new
> check_pkg_config libzmq libzmq >= 4.2.1 zmq.h zmq_ctx_new
> test_pkg_config libzmq libzmq >= 4.2.1 zmq.h zmq_ctx_new
> pkg-config --exists --print-errors libzmq >= 4.2.1
> check_func_headers zmq.h zmq_ctx_new -I/usr/include/pgm-5.2 -I/usr/lib/pgm-5.2/include -lzmq

Cheers,
Moritz