diff --git a/ChangeLog b/ChangeLog
index db0dcef..a0b8e96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2001-01-12  Ben Elliston  <bje@redhat.com>
+
+	* config.guess: Detect common kernels running on various PDP-10
+	architectures. Contributed by Lars Brinkhoff <lars@nocrew.org>.
+	* config.sub: Handle PDP-10.
+
 2001-01-10  Ben Elliston  <bje@redhat.com>
 
 	* config.guess: Detect LynxOS 3.x on PowerPC architectures.
diff --git a/config.guess b/config.guess
index e6ff4b8..e0b5c7b 100755
--- a/config.guess
+++ b/config.guess
@@ -3,7 +3,7 @@
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
 #   Free Software Foundation, Inc.
 
-timestamp='2001-01-10'
+timestamp='2001-01-12'
 
 # 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
@@ -1198,6 +1198,24 @@ EOF
 	# is probably installed.
 	echo ${UNAME_MACHINE}-pc-os2-emx
 	exit 0 ;;
+    *:TOPS-10:*:*)
+	echo pdp10-unknown-tops10
+	exit 0 ;;
+    *:TENEX:*:*)
+	echo pdp10-unknown-tenex
+	exit 0 ;;
+    KS10:TOPS-20:*:* | KL10:TOPS-20:*:* | TYPE4:TOPS-20:*:*)
+	echo pdp10-dec-tops20
+	exit 0 ;;
+    XKL-1:TOPS-20:*:* | TYPE5:TOPS-20:*:*)
+	echo pdp10-xkl-tops20
+	exit 0 ;;
+    *:TOPS-20:*:*)
+	echo pdp10-unknown-tops20
+	exit 0 ;;
+    *:ITS:*:*)
+	echo pdp10-unknown-its
+	exit 0 ;;
 esac
 
 #echo '(No uname command or uname output not recognized.)' 1>&2
diff --git a/config.sub b/config.sub
index a97fdc3..48750c0 100755
--- a/config.sub
+++ b/config.sub
@@ -3,7 +3,7 @@
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
 #   Free Software Foundation, Inc.
 
-timestamp='2001-01-07'
+timestamp='2001-01-12'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -69,7 +69,7 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)
 
-Copyright (C) 1992, 93, 94, 95, 96, 97, 98, 99, 2000
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
@@ -226,7 +226,8 @@ case $basic_machine in
 		| alphaev6[78] \
 		| we32k | ns16k | clipper | i370 | sh | sh[34] \
 		| powerpc | powerpcle \
-		| 1750a | dsp16xx | pdp11 | mips16 | mips64 | mipsel | mips64el \
+		| 1750a | dsp16xx | pdp10 | pdp11 \
+		| mips16 | mips64 | mipsel | mips64el \
 		| mips64orion | mips64orionel | mipstx39 | mipstx39el \
 		| mips64vr4300 | mips64vr4300el | mips64vr4100 | mips64vr4100el \
 		| mips64vr5000 | miprs64vr5000el | mcore \
@@ -268,7 +269,7 @@ case $basic_machine in
 	      | alphaev6[78]-* \
 	      | we32k-* | cydra-* | ns16k-* | pn-* | np1-* | xps100-* \
 	      | clipper-* | orion-* \
-	      | sparclite-* | pdp11-* | sh-* | powerpc-* | powerpcle-* \
+	      | sparclite-* | pdp10-* | pdp11-* | sh-* | powerpc-* | powerpcle-* \
 	      | sparc64-* | sparcv9-* | sparc86x-* | mips16-* | mips64-* | mipsel-* \
 	      | mips64el-* | mips64orion-* | mips64orionel-* \
 	      | mips64vr4100-* | mips64vr4100el-* | mips64vr4300-* | mips64vr4300el-* \
@@ -919,6 +920,10 @@ case $basic_machine in
 	vax)
 		basic_machine=vax-dec
 		;;
+	pdp10)
+		# there are many clones, so DEC is not a safe bet
+		basic_machine=pdp10-unknown
+		;;
 	pdp11)
 		basic_machine=pdp11-dec
 		;;
@@ -1009,7 +1014,8 @@ case $os in
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
 	      | -mingw32* | -linux-gnu* | -uxpv* | -beos* | -mpeix* | -udk* \
 	      | -interix* | -uwin* | -rhapsody* | -darwin* | -opened* \
-	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* | -storm-chaos*)
+	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
@@ -1141,6 +1147,9 @@ case $basic_machine in
 	arm*-semi)
 		os=-aout
 		;;
+	pdp10-*)
+		os=-tops20
+		;;
         pdp11-*)
 		os=-none
 		;;