Basic reporting of .Xrs to manual pages that don't exist

in the base system, inspired by mdoclint(1).

We are able to do this because (1) the -mdoc parser, the -Tlint validator,
and the man(1) manual page lookup code are all in the same program
and (2) the mandoc.db(5) database format allows fast lookup.

Feedback from, previous versions tested by, and OK jmc@.

A few features will be added to this in the tree, step by step.

1 files changed, 1 insertions, 0 deletions

diff --git a/read.c b/read.c
index dedb234d..2327b6ee 100644
--- a/read.c
+++ b/read.c
@@ -93,6 +93,7 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 	"unknown architecture",
 	"operating system explicitly specified",
 	"RCS id missing",
+	"referenced manual not found",
 
 	"generic style suggestion",