libidn11-dev 1.33-1ubuntu0.1 (amd64 binary) in ubuntu zesty

 GNU Libidn is a fully documented implementation of the Stringprep,
 Punycode and IDNA specifications. Libidn's purpose is to encode and
 decode internationalized domain names. The Nameprep, XMPP, SASLprep,
 and iSCSI profiles are supported.
 .
 This package contains the header files, static library, pkg-config
 information, API man pages, and the Libidn manual.