Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

For variables that are only checked with defined(), don't provide
any fake value.

Use a single style for share/doc/ makefiles.

Preprocess with tbl(1), eliminate warnings.

Note that this is a historical document and that users should refer
to flex(1) in preference.

Reviewed by: grog
Approved by: dwmalone (mentor)

Fixed build of recently added legacy docs.

Reviewed by: grog

Unbreak world.

Obtained from: mark
Pointy hat to: grog

Change msU macros to mU.

This is only a partial solution; the whole issue of building the
documentation needs to be revisited.

Remove original license disclaimer.
Add Caldera license.

Approved by: David Taylor <davidt@caldera.com>

Make buildable under FreeBSD.

This one's a real mess. It's full of undefined macros, and in one
place deliberately causes syntax warnings. I've decided against
taking out the undefined macros: they don't alter the format of the
output document, and maybe one day somebody will put in the macro
definitions.

Note that this file corrects a number of format errors which appear in
the O'Reilly 4.4BSD manual set.

Initial checkin: 4.4BSD version. These files need to be updated with
current license information and adapted to the FreeBSD build
environment before they will build.

Approved by: David Taylor <davidt@caldera.com>