anchor.diff:      directfb
       fdk_aac
       flite
  +    gsm
       libaom
       libdc1394
       libde265
  
positive.code: , directfb
  , fdk_aac
  , flite
  , libaom
  , libdc1394
  , libde265
  
negative.code: 
      "-Ddts=disabled" # required `libdca` library not packaged in nixpkgs as of writing, and marked as "BIG FAT WARNING: libdca is still in early development"
      "-Dfaac=${if faacSupport then "enabled" else "disabled"}"
      "-Diqa=disabled" # required `dssim` library not packaging in nixpkgs as of writing
      "-Dmsdk=disabled" # not packaged in nixpkgs as of writing / no Windows support
      # As of writing, with `libmpcdec` in `buildInputs` we get
  