How can I use gettext in vala?

When I try to use gettext in vala I get not errors or warnings from vala but I get the following error from the c compiler:

/usr/include/glib-2.0/glib/gi18n-lib.h:29:2: error: #error You must define GETTEXT_开发者_开发问答PACKAGE before including gi18n-lib.h. Did you forget to include config.h?

How can I fix this?

To solve this problem I had to both add -X -DGETTEXT_PACKAGE="..." to the valac command and add const string GETTEXT_PACKAGE = "..."; to the top of my source file.

If I don't add that to the top of my source file, I get lots of undeclared (first use in this function) errors from the C compiler for some reason.

I do, however, get a warning from the C compiler for redefining GETTEXT_PACKAGE.

I think the most common solution is to just pass -DGETTEXT_PACKAGE="..." to the C compiler (if you're just relying on valac to invoke it, pass -X -DGETTEXT_PACKAGE="..." to valac).

This can help: https://bugzilla.gnome.org/show_bug.cgi?id=618931