anchor.diff:      "-Dsvthevcenc=disabled" # required `SvtHevcEnc` library not packaged in nixpkgs as of writing
       "-Dteletext=disabled" # required `zvbi` library not packaged in nixpkgs as of writing
       "-Dtinyalsa=disabled" # not packaged in nixpkgs as of writing
  -    "-Dvoaacenc=disabled" # required `vo-aacenc` library not packaged in nixpkgs as of writing
       "-Dvoamrwbenc=disabled" # required `vo-amrwbenc` library not packaged in nixpkgs as of writing
       "-Dvulkan=disabled" # Linux-only, and we haven't figured out yet which of the vulkan nixpkgs it needs
       "-Dwasapi=disabled" # not packaged in nixpkgs as of writing / no Windows support
  
positive.code: { lib, stdenv
  , fetchurl
  , fetchpatch
  , meson
  , ninja
  , gettext
  , config
  , pkg-config
  , python3
  , gst-plugins-base
  
negative.code:     libxml2
      libintl
      srt
      vo-aacenc
    ] ++ optionals enableZbar [
      zbar
    ] ++ optionals faacSupport [
  