[FFmpeg-user] ERROR: libass >= 0.11.0 not found using pkg-config

[Alexander Strasser]

On 2024-12-25 22:40 +0900, kozaick via ffmpeg-user wrote:
> On Wed, 25 Dec 2024 21:07:44 +0900
> Masaru Nomiya <nomiya at lake.dti.ne.jp> wrote:
>
[...]
> > [kozaick] == kozaick via ffmpeg-user <ffmpeg-user at ffmpeg.org> has written:
> >
> > kozaick> Hello.
> > kozaick> I am trying to compile ffmpeg with libass included for windows in ubuntu container (docker).
> > kozaick> But I get an error when running the configure file.
> > kozaick> To check, I placed the following command in the test_pkg_config() method of the configure file.
> > kozaick> ---
> > kozaick> echo “Checking package: $pkg_version”
> > kozaick> pkg-config --exists --print-errors $pkg_version
> > kozaick> echo “pkg-config exit code: $?”
> > kozaick> ---
> > kozaick> And display like this.
> > kozaick> ---
> > kozaick> Checking package: libass >= 0.11.0
> > kozaick> pkg-config exit code: 0
> > kozaick> ERROR: libass >= 0.11.0 not found using pkg-config
> > [...]
> >
> > This says that libass.pc cannot be found. Your compilation method
> > should have created libass.pc, but since /usr/local/lib/pkgconfig is
> > missing, it is probably not installed.
> >
> > How about this?
> >
> >    1. $ sudo mkdir /usr/local/lib/pkgconfig
> >
> >    2. $ sudo cp somewhere/libass.pc /usr/local/lib/pkgconfig
> >
> > Best Reagrs & お休みなさい．
> >
> > ---
> > ┏━━┓彡     Masaru Nomiya                   mail-to: nomiya @ lake.dti.ne.jp
> > ┃＼／彡
> > ┗━━┛       "Reading widely about things that don't seem immediately or
> > 	       practically useful, in the hope that what you learn now may prove
> > 	       meaningful later―that's pretty much the definition of a liberal-
> > 	       arts education. Who knew that one of its best defenders would turn
> > 	       out to be a computer scientist?"
> >
> >                     -- "What Does It Really Mean to Learn?" THE NEW YORKER --
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>
> Thank you for quick reply.
>
> First, I forgot to mention that I have set the following my environment variables,
> PKG_CONFIG_LIBDIR="/usr/local/x86_64-w64-mingw32/lib/pkgconfig:$PKG_CONFIG_LIBDIR”
> PKG_CONFIG_PATH="/usr/local/x86_64-w64-mingw32/lib/pkgconfig:$PKG_CONFIG_PATH”
> The setting you mentioned to put the .pc file in /usr/local/lib/pkgconfig does not work in my environment when I do this, and pkg-config returns 1.
> I think the error is probably related to the configure file itself.?
>
> Second, I forgot to attach the config.log file, Sorry.
> So, I attached this.
> Thanks for let me know.
>
> Finally, My container envrioment is ubuntu 24.04 x86_64, ffmpeg release 7.1 from github, gcc 13, g++-mingw-w64-x86-64.
>
> ありがとう & お休みなさい．

I think this your problem at hand:

    WARNING: x86_64-w64-mingw32-pkg-config not found, library detection may fail.

You should also see it somewhere in the output, but I took this line
from your `config.log`.

It means ffmpeg cannot run the pkg-config executable it expects to and
instead uses `false` which will always give a negative (non-zero) exit
status.


Best regards,
  Alexander