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 11.2.3 Locating Message Catalog Files
 -------------------------------------
 
 Because many different languages for many different packages have to be
 stored we need some way to add these information to file message catalog
 files.  The way usually used in Unix environments is have this encoding
 in the file name.  This is also done here.  The directory name given in
 `bindtextdomain's second argument (or the default directory), followed
 by the value and name of the locale and the domain name are
 concatenated:
 
      DIR_NAME/LOCALE/LC_CATEGORY/DOMAIN_NAME.mo
 
    The default value for DIR_NAME is system specific.  For the GNU
 library, and for packages adhering to its conventions, it's:
      /usr/local/share/locale
 
 LOCALE is the value of the locale whose name is this `LC_CATEGORY'.
 For `gettext' and `dgettext' this `LC_CATEGORY' is always
 `LC_MESSAGES'.(1) The value of the locale is determined through
 `setlocale (LC_CATEGORY, NULL)'.  (2) `dcgettext' specifies the locale
 category by the third argument.
 
    ---------- Footnotes ----------
 
    (1) Some system, eg Ultrix, don't have `LC_MESSAGES'.  Here we use a
 more or less arbitrary value for it, namely 1729, the smallest positive
 integer which can be represented in two different ways as the sum of
 two cubes.
 
    (2) When the system does not support `setlocale' its behavior in
 setting the locale values is simulated by looking at the environment
 variables.
 

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