diff --git a/build-aux/config.sub b/build-aux/config.sub
index de4259e4..9865d6ea 100644
--- a/build-aux/config.sub
+++ b/build-aux/config.sub
@@ -4,7 +4,7 @@
 
 # shellcheck disable=SC2006,SC2268 # see below for rationale
 
-timestamp='2023-01-21'
+timestamp='2023-06-26'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -82,7 +82,7 @@ This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
 
 help="
-Try \`$me --help' for more information."
+Try '$me --help' for more information."
 
 # Parse command line
 while test $# -gt 0 ; do
@@ -130,7 +130,7 @@ IFS=$saved_IFS
 # Separate into logical components for further validation
 case $1 in
 	*-*-*-*-*)
-		echo Invalid configuration \`"$1"\': more than four components >&2
+		echo "Invalid configuration '$1': more than four components" >&2
 		exit 1
 		;;
 	*-*-*-*)
@@ -145,7 +145,8 @@ case $1 in
 			nto-qnx* | linux-* | uclinux-uclibc* \
 			| uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* \
 			| netbsd*-eabi* | kopensolaris*-gnu* | cloudabi*-eabi* \
-			| storm-chaos* | os2-emx* | rtmk-nova* | managarm-*)
+			| storm-chaos* | os2-emx* | rtmk-nova* | managarm-* \
+			| windows-* )
 				basic_machine=$field1
 				basic_os=$maybe_os
 				;;
@@ -943,7 +944,7 @@ $basic_machine
 EOF
 		IFS=$saved_IFS
 		;;
-	# We use `pc' rather than `unknown'
+	# We use 'pc' rather than 'unknown'
 	# because (1) that's what they normally are, and
 	# (2) the word "unknown" tends to confuse beginning users.
 	i*86 | x86_64)
@@ -1285,7 +1286,7 @@ case $cpu-$vendor in
 				;;
 
 			*)
-				echo Invalid configuration \`"$1"\': machine \`"$cpu-$vendor"\' not recognized 1>&2
+				echo "Invalid configuration '$1': machine '$cpu-$vendor' not recognized" 1>&2
 				exit 1
 				;;
 		esac
@@ -1766,11 +1767,11 @@ case $os in
 		;;
 	none)
 		;;
-	kernel* )
+	kernel* | msvc* )
 		# Restricted further below
 		;;
 	*)
-		echo Invalid configuration \`"$1"\': OS \`"$os"\' not recognized 1>&2
+		echo "Invalid configuration '$1': OS '$os' not recognized" 1>&2
 		exit 1
 		;;
 esac
@@ -1785,18 +1786,24 @@ case $kernel-$os in
 		;;
 	managarm-mlibc* | managarm-kernel* )
 		;;
+	windows*-gnu* | windows*-msvc*)
+		;;
 	-dietlibc* | -newlib* | -musl* | -relibc* | -uclibc* | -mlibc* )
 		# These are just libc implementations, not actual OSes, and thus
 		# require a kernel.
-		echo "Invalid configuration \`$1': libc \`$os' needs explicit kernel." 1>&2
+		echo "Invalid configuration '$1': libc '$os' needs explicit kernel." 1>&2
 		exit 1
 		;;
 	-kernel* )
-		echo "Invalid configuration \`$1': \`$os' needs explicit kernel." 1>&2
+		echo "Invalid configuration '$1': '$os' needs explicit kernel." 1>&2
 		exit 1
 		;;
 	*-kernel* )
-		echo "Invalid configuration \`$1': \`$kernel' does not support \`$os'." 1>&2
+		echo "Invalid configuration '$1': '$kernel' does not support '$os'." 1>&2
+		exit 1
+		;;
+	*-msvc* )
+		echo "Invalid configuration '$1': '$os' needs 'windows'." 1>&2
 		exit 1
 		;;
 	kfreebsd*-gnu* | kopensolaris*-gnu*)
@@ -1813,7 +1820,7 @@ case $kernel-$os in
 		# Blank kernel with real OS is always fine.
 		;;
 	*-*)
-		echo "Invalid configuration \`$1': Kernel \`$kernel' not known to work with OS \`$os'." 1>&2
+		echo "Invalid configuration '$1': Kernel '$kernel' not known to work with OS '$os'." 1>&2
 		exit 1
 		;;
 esac