GNU International Domain Name Library (current version 2). GNU Libidn2 is an implementation of the IDNA2008 + TR46 specifications (RFC 5890, RFC 5891, RFC 5892, RFC 5893, TR 46). Libidn2 is a standalone library, without any dependency on Libidn. Libidn2 is believed to be a complete IDNA2008 / TR46 implementation.
https://www.gnu.org/software/libidn/#libidn2
This installer guides you through the steps necessary to install libidn2 2.3.8 for macOS. To get started, click Continue.