On OpenBSD, the APV requires a modified version of the chio command which
allows us to read barcodes on tapes in the tape library.

The directory chio contains source code for the modified chio, based on
OPENBSD 2.9 current as of 5/17/2001.

Alternatively, the file user_patch contains a patch which can be applied to
the /usr/src tree.

The file make_patch is a script used to help us make the patch; ignore it.
