On Sat, Jan 12, 2019 at 01:13:09PM +0100, Arne Babenhauserheide wrote:
> There’s a problem with my patch: ffmpeg-3.4 inherits the values of ffmpeg but does not support the --enable-aom option.
> 
> How can I filter it?

Take a look at ((guix utils) substitute-keyword-arguments) and examples
of it being used in existing packages. Basically, you'll inherit the
arguments of ffmpeg but replace #:configure-flags with something
appropriate for ffmpeg-3.4.