CHECK_HEADERS([opus], [libopus headers], [opus/opus_multistream.h])
CHECK_LIB([libaom], [aom], [aom_codec_version])
CHECK_HEADERS([libaom], [libaom headers], [aom/aom.h])
CHECK_HEADERS([opus], [libopus headers], [opus/opus_multistream.h])
CHECK_LIB([libaom], [aom], [aom_codec_version])
CHECK_HEADERS([libaom], [libaom headers], [aom/aom.h])