Binary package “libutf8proc-dev” in ubuntu xenial

C library for processing UTF-8 Unicode data (development files)

 utf8proc is a small, clean C library that provides Unicode normalization,
 case-folding, and other operations for data in the UTF-8 encoding, supporting
 Unicode version 8.0.
 .
 This package contains the development files needed to compile software using
 utf8proc.