#### Internationalization

GLib doesn’t force any particular localization method upon its users. But since GLib itself is localized using the `gettext()` mechanism, it seems natural to offer the de-facto standard `gettext()` support macros in an easy-to-use form.

In order to use these macros in an application, you must include `<glib/gi18n.h>`. For use in a library, you must include `<glib/gi18n-lib.h>` after defining the `GETTEXT_PACKAGE` macro suitably for your library:

    #define GETTEXT_PACKAGE "gtk4"
    #include <glib/gi18n-lib.h>

For an application, note that you also have to call `bindtextdomain()`, `bind_textdomain_codeset()`, `textdomain()` and `setlocale()` early on in your `main()` to make `gettext()` work. For example:

    #include <glib/gi18n.h>
    #include <locale.h>

    int
    main (int argc, char **argv)
    {
      setlocale (LC_ALL, "");
      bindtextdomain (GETTEXT_PACKAGE, DATADIR "/locale");
      bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
      textdomain (GETTEXT_PACKAGE);

      // Rest of your application.
    }

where `DATADIR` is as typically provided by Automake or Meson.

For a library, you only have to call `bindtextdomain()` and `bind_textdomain_codeset()` in your initialization function. If your library doesn’t have an initialization function, you can call the functions before the first translated message.

The gettext manual covers details of how to integrate gettext into a project’s build system and workflow.