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 8.3.6 GNU and old GNU `tar' format
 ----------------------------------
 
 GNU `tar' was based on an early draft of the POSIX 1003.1 `ustar'
 standard.  GNU extensions to `tar', such as the support for file names
 longer than 100 characters, use portions of the `tar' header record
 which were specified in that POSIX draft as unused.  Subsequent changes
 in POSIX have allocated the same parts of the header record for other
 purposes.  As a result, GNU `tar' format is incompatible with the
 current POSIX specification, and with `tar' programs that follow it.
 
    In the majority of cases, `tar' will be configured to create this
 format by default.  This will change in future releases, since we plan
 to make `POSIX' format the default.
 
    To force creation a GNU `tar' archive, use option `--format=gnu'.
 
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