by our native libintl. While it is not implemented, this allows us to build
programs against the native libintl, loosing very few functionality (some
translations of plural messages on few languages), and avoiding runtime
conflicts between native libintl and the gnu one (coming from the gettext
package).
Packages including .po files with uses of msgid_plural should define the
USE_MSGFMT_PLURALS variable to 'yes', so that the msgfmt wrapper is used.
(Do not use it when not really needed, as it will pull in perl5 as a build
dependancy).
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