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Locales
To allow simultaneous use of packages linked against different versions of glibc with different locale archive formats, Nixpkgs patches glibc to rely on LOCALE_ARCHIVE environment variable.
On non-NixOS distributions, this variable is obviously not set. This can cause regressions in language support or even crashes in some Nixpkgs-provided programs. The simplest way to mitigate this problem is exporting the LOCALE_ARCHIVE variable pointing to ${glibcLocales}/lib/locale/locale-archive. The drawback (and the reason this is not the default) is the relatively large (a hundred MiB) size of the full set of locales. It is possible to build a custom set of locales by overriding parameters allLocales and locales of the package.