libopusfile-dev 0.9+20170913-1build1 (arm64 binary) in ubuntu cosmic

 libopusfile provides several sets of built-in routines for file and stream
 access, and may also use custom stream I/O routines provided by the embedded
 environment. There are built-in I/O routines provided for ANSI-compliant
 stdio (FILE *), memory buffers, and URLs (including <file:> URLs, plus
 optionally <http:> and <https:> URLs).
 .
 It is implemented as a layer on top of Xiph.Org's reference libogg and
 libopus libraries.
 .
 This package provides the Opus library headers and development files.