+version 1.13.10 - Paul Eggert, 1999-08-20.
+
+* `tar' now uses signed base-64 when outputting header values that are
+ out of the range of the standard unsigned base-8 format. This
+ affects archive members with negative timestamps or uids, and
+ archive members 8 GB or larger. The new tar archives cannot be read
+ by traditional tar, or by older versions of GNU tar. Use the
+ --old-archive option to revert to the old behavior, which uses
+ unportable representations for negative values, and which rejects
+ large files.
+