**WARNING**: a serious bug exists in this version; see the 1.0.21 change
list for details.

**WARNING**: Due to changes in cache directory and archive formats,
pre-1.0.20 versions of Tarsnap should not be used to create archives
after 1.0.20 or later versions of Tarsnap are used by the same machine.

Changes since 1.0.19:
* Add --checkpoint-bytes <bytespercheckpoint> option to Tarsnap and
  associated configuration file option. This instructs tarsnap -c to
  store a checkpoint every <bytespercheckpoint> bytes; if Tarsnap (or
  the system on which Tarsnap is running) crashes, or the system's
  internet connection fails, in the middle of creating an archive, it
  will now be truncated at the last checkpoint instead of being lost
  entirely.
* Add Debian package-building metadata and Arch Linux PKGBUILD file.
  Thanks to Mads Sülau Jørgensen and Aaron Schaefer for their help with
  these.
* Minor bug fixes to autoconf build.