---
name: "idn2_check_version"
section: "3"
platform: "linux"
package: "libidn2"
version: "2.3.8-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/idn2_check_version"
---

# idn2\_check\_version(3)

API function

## NAME

idn2\_check\_version - API function

## SYNOPSIS

**#include \<idn2.h\>**

**const char \* idn2\_check\_version(const char \*** *req\_version***);**

## ARGUMENTS

- const char \* req\_version

  version string to compare with, or NULL.

## DESCRIPTION

Check IDN2 library version.  This function can also be used to read out the version of the library code used.  See **IDN2\_VERSION** for a suitable  *req\_version* string, it corresponds to the idn2.h header file version.  Normally these two version numbers match, but if you are using an application built against an older libidn2 with a newer libidn2 shared library they will be different.

Return value: Check that the version of the library is at minimum the one given as a string in  *req\_version* and return the actual version string of the library; return NULL if the condition is not met.  If NULL is passed to this function no check is done and only the version string is returned.

## REPORTING BUGS

Report bugs to \<help-libidn@gnu.org\>.\
 General guidelines for reporting bugs: https://www.gnu.org/gethelp/\
 Libidn2 home page: https://www.gnu.org/software/libidn2/

## COPYRIGHT

Copyright © 2002-2025 Simon Josefsson.\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **libidn2** is maintained as a Texinfo manual.  If the **info** and **libidn2** programs are properly installed at your site, the command

-

  **info libidn2**

should give you access to the complete manual. As an alternative you may obtain the manual from:

-

  **https://www.gnu.org/software/libidn/libidn2/manual/**