If command line options are not specified, the precompiler’s localization values are determined at precompiler runtime as follows:
If the LC_ALL environment variable is set, the application uses its value to localize, matching LC_ALL’s value to an entry in the locales file to determine what language and character set to use.
If the LC_ALL environment variable is not set but the LANG environment variable is, the application uses its value to localize, matching LANG’s value to an entry in the locales file to determine what language and character set to use.
If neither environment variable is set, the application uses the “default” entry in the locales file to localize.
