From 8c8574acb85169447168bdf08d5718ba7cf2be85 Mon Sep 17 00:00:00 2001
From: Mark Johnston <markj@FreeBSD.org>
Date: Thu, 23 Feb 2023 21:45:01 -0500
Subject: [PATCH] config: Include errno.h in mkmakefile.cc

Commit da8884202940 ("config: error out on malformed env/hint lines")
added a reference to EINVAL.  In some configurations the bootstrap tools
build fails for lack of errno definitions.

Fixes:	da8884202940 ("config: error out on malformed env/hint lines")
Reported by:	syzbot+b1a5d112a737d9a2be9b@syzkaller.appspotmail.com
---
 usr.sbin/config/mkmakefile.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/usr.sbin/config/mkmakefile.cc b/usr.sbin/config/mkmakefile.cc
index 2aaed82ce3ee..232933711ce5 100644
--- a/usr.sbin/config/mkmakefile.cc
+++ b/usr.sbin/config/mkmakefile.cc
@@ -44,6 +44,7 @@ static const char rcsid[] =
  */
 #include <sys/param.h>
 
+#include <cerrno>
 #include <ctype.h>
 #include <err.h>
 #include <stdarg.h>