-.\" $OpenBSD: ddb.4,v 1.86 2017/04/22 11:05:04 visa Exp $
+.\" $OpenBSD: ddb.4,v 1.87 2017/05/01 06:39:25 mpi Exp $
.\" $NetBSD: ddb.4,v 1.5 1994/11/30 16:22:09 jtc Exp $
.\"
.\" Mach Operating System
.\" any improvements or extensions that they make and grant Carnegie Mellon
.\" the rights to redistribute these changes.
.\"
-.Dd $Mdocdate: April 22 2017 $
+.Dd $Mdocdate: May 1 2017 $
.Dt DDB 4
.Os
.Sh NAME
.Xr witness 4 ,
.Xr sysctl.conf 5 ,
.Xr hangman 6 ,
-.Xr kgdb 7 ,
.Xr crash 8 ,
.Xr sysctl 8 ,
.Xr extent 9 ,
-.\" $OpenBSD: intro.7,v 1.17 2015/04/25 16:37:17 jmc Exp $
+.\" $OpenBSD: intro.7,v 1.18 2017/05/01 06:39:25 mpi Exp $
.\" $NetBSD: intro.7,v 1.3 1994/11/30 19:07:15 jtc Exp $
.\"
.\" Copyright (c) 1983, 1990, 1993
.\"
.\" @(#)intro.7 8.1 (Berkeley) 6/5/93
.\"
-.Dd $Mdocdate: April 25 2015 $
+.Dd $Mdocdate: May 1 2017 $
.Dt INTRO 7
.Os
.Sh NAME
File system hierarchy.
.It Xr hostname 7
Hostname resolution rules.
-.It Xr kgdb 7
-Remote kernel debugging with gdb.
.It Xr library-specs 7
Shared library name specifications.
.It Xr mailaddr 7
-.\" $OpenBSD: config.8,v 1.62 2017/04/30 20:09:27 mpi Exp $
+.\" $OpenBSD: config.8,v 1.63 2017/05/01 06:39:25 mpi Exp $
.\" $NetBSD: config.8,v 1.10 1996/08/31 20:58:16 mycroft Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\"
.\" from: @(#)config.8 8.2 (Berkeley) 4/19/94
.\"
-.Dd $Mdocdate: April 30 2017 $
+.Dd $Mdocdate: May 1 2017 $
.Dt CONFIG 8
.Os
.Sh NAME
.Pp
To debug kernels and their crash dumps with gdb, add
.Dq makeoptions DEBUG="-g"
-to the kernel configuration file, along with (typically)
+to the kernel configuration file.
+Refer to
+.Xr options 4
+for further details.
.Pp
Many other statements exist, and the file format is fairly rich; for more
information see the various configuration files included in the system, as