Andrea,
Let me know if this worked for you.  We should put this in the manual "Installation" portion so that it is clearer.  I noticed that there is an example on page 16, but not very obvious and only a very specific example as quoted here:
   export FFMPEG_EXTRA_CFG=" --enable-libfdk-aac --enable-nonfree"
   export EXTRA_LIBS=" -lfdk-aac"

On Wed, Jul 14, 2021 at 9:36 AM Andrew Randrianasulu via Cin <cin@lists.cinelerra-gg.org> wrote:


On Wednesday, July 14, 2021, Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:
I wanted to try the "zscale" plugin of ffmpeg (inside CinGG, of
course). I installed the zimg library and now I need to configure
FFmpeg with --enable-libzimg.
How can I do this?

 try to set those two variables before launching ./configure


EXTRA_LIBS=" -lOpenCL -ldav1d -lxvidcore -lass -lbluray -lsnappy" \
FFMPEG_EXTRA_CFG=" --enable-opencl --enable-frei0r --enable-libdav1d --enable-libxvid --enable-libass --enable-libbluray --enable-libsnappy" \


this is my example, you can just add what your ffmpeg config need... 




https://ffmpeg.org/ffmpeg-filters.html#zscale-1
https://github.com/FFmpeg/FFmpeg/commit/416e35e5aafc2a2bf77372d5e8479c28796d1451
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