ERROR: gnutls not found using pkg-config

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.libera.chat.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.
make[3]: *** [Makefile:752: /builder/shared-workdir/build/sdk/build_dir/target-powerpc_8540_musl/ffmpeg-full/ffmpeg-5.0.1/.configured_e78145485e6b0d78ca0a7ad0e57c975b] Error 1
time: package/feeds/packages/ffmpeg/full/compile#5.75#2.81#22.18