diff --git a/ChangeLog b/ChangeLog
index 97058b1..e5a31c7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,17 @@
 2007-02-17  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
+	GNU libtool 1.5.23b is released.
+
+	* configure.ac: Bump version.  Adjust copyright years.
+	* NEWS: Updated.
+	* config.guess, config.sub, install-sh, texinfo.tex, INSTALL:
+	Updated from external sources.
+	* libtool.m4: Bump serial.
+	* ltdl.m4: Likewise.  Adjust copyright years.
+	* libltdl/Makefile.am: Bump library revision.
+
+2007-02-17  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
 	* libtool.m4 (AC_LIBTOOL_PROG_LD_SHLIBS) [ linux ]
 	<whole_archive_flag_spec>: For Sun C/C++ 5.9, do not add
 	/dev/null as dummy object, it fails with GNU ld version
@@ -640,7 +652,7 @@
 
 2005-11-12  Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
 
-	* libltdl.m4 (AC_LIBTOOL_PROG_COMPILER_PIC): `wl' is tagged
+	* libtool.m4 (AC_LIBTOOL_PROG_COMPILER_PIC): `wl' is tagged
 	here.
 
 	* libtool.m4 (AC_LIBTOOL_DLOPEN_SELF)
diff --git a/NEWS b/NEWS
index 8e86f24..4327a0e 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 NEWS - list of user-visible changes between releases of GNU Libtool
 
-New in 1.5.23a: 2006-??-??; CVS version 1.5.23a, Libtool team:
+New in 1.5.23b: 2007-02-17; CVS version 1.5.23a, Libtool team:
 * Initial support for RDOS.
 * Fix regression on DragonFly that disabled library hardcoding.
 * Fix regression on OpenBSD, NetBSD, DragonFly, and other systems
diff --git a/config.guess b/config.guess
index c085f4f..6cc26cd 100755
--- a/config.guess
+++ b/config.guess
@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
 #   Inc.
 
-timestamp='2006-05-13'
+timestamp='2007-01-15'
 
 # 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
@@ -161,6 +161,7 @@
 	    arm*) machine=arm-unknown ;;
 	    sh3el) machine=shl-unknown ;;
 	    sh3eb) machine=sh-unknown ;;
+	    sh5el) machine=sh5le-unknown ;;
 	    *) machine=${UNAME_MACHINE_ARCH}-unknown ;;
 	esac
 	# The Operating System including object format, if it has switched
@@ -211,7 +212,7 @@
 	echo ${UNAME_MACHINE}-unknown-solidbsd${UNAME_RELEASE}
 	exit ;;
     macppc:MirBSD:*:*)
-	echo powerppc-unknown-mirbsd${UNAME_RELEASE}
+	echo powerpc-unknown-mirbsd${UNAME_RELEASE}
 	exit ;;
     *:MirBSD:*:*)
 	echo ${UNAME_MACHINE}-unknown-mirbsd${UNAME_RELEASE}
@@ -780,7 +781,7 @@
     i*:CYGWIN*:*)
 	echo ${UNAME_MACHINE}-pc-cygwin
 	exit ;;
-    i*:MINGW*:*)
+    *:MINGW*:*)
 	echo ${UNAME_MACHINE}-pc-mingw32
 	exit ;;
     i*:windows32*:*)
@@ -790,10 +791,10 @@
     i*:PW*:*)
 	echo ${UNAME_MACHINE}-pc-pw32
 	exit ;;
-    x86:Interix*:[345]*)
+    x86:Interix*:[3456]*)
 	echo i586-pc-interix${UNAME_RELEASE}
 	exit ;;
-    EM64T:Interix*:[345]*)
+    EM64T:Interix*:[3456]* | authenticamd:Interix*:[3456]*)
 	echo x86_64-unknown-interix${UNAME_RELEASE}
 	exit ;;
     [345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
@@ -831,6 +832,9 @@
     arm*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
+    avr32*:Linux:*:*)
+	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	exit ;;
     cris:Linux:*:*)
 	echo cris-axis-linux-gnu
 	exit ;;
@@ -947,6 +951,9 @@
     x86_64:Linux:*:*)
 	echo x86_64-unknown-linux-gnu
 	exit ;;
+    xtensa:Linux:*:*)
+    	echo xtensa-unknown-linux-gnu
+	exit ;;
     i*86:Linux:*:*)
 	# The BFD linker knows what the default object file format is, so
 	# first see if it will tell us. cd to the root directory to prevent
@@ -1205,6 +1212,15 @@
     SX-6:SUPER-UX:*:*)
 	echo sx6-nec-superux${UNAME_RELEASE}
 	exit ;;
+    SX-7:SUPER-UX:*:*)
+	echo sx7-nec-superux${UNAME_RELEASE}
+	exit ;;
+    SX-8:SUPER-UX:*:*)
+	echo sx8-nec-superux${UNAME_RELEASE}
+	exit ;;
+    SX-8R:SUPER-UX:*:*)
+	echo sx8r-nec-superux${UNAME_RELEASE}
+	exit ;;
     Power*:Rhapsody:*:*)
 	echo powerpc-apple-rhapsody${UNAME_RELEASE}
 	exit ;;
diff --git a/config.sub b/config.sub
index 4d936e2..5defff6 100755
--- a/config.sub
+++ b/config.sub
@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation,
 #   Inc.
 
-timestamp='2006-05-13'
+timestamp='2007-01-18'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -241,16 +241,16 @@
 	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \
 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
 	| am33_2.0 \
-	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr \
+	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr | avr32 \
 	| bfin \
 	| c4x | clipper \
 	| d10v | d30v | dlx | dsp16xx \
-	| fr30 | frv \
+	| fido | fr30 | frv \
 	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 	| i370 | i860 | i960 | ia64 \
 	| ip2k | iq2000 \
 	| m32c | m32r | m32rle | m68000 | m68k | m88k \
-	| maxq | mb | microblaze | mcore \
+	| maxq | mb | microblaze | mcore | mep \
 	| mips | mipsbe | mipseb | mipsel | mipsle \
 	| mips16 \
 	| mips64 | mips64el \
@@ -276,6 +276,7 @@
 	| pdp10 | pdp11 | pj | pjl \
 	| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
 	| pyramid \
+	| score \
 	| sh | sh[1234] | sh[24]a | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
 	| sh64 | sh64le \
 	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
@@ -284,7 +285,7 @@
 	| tahoe | thumb | tic4x | tic80 | tron \
 	| v850 | v850e \
 	| we32k \
-	| x86 | xscale | xscalee[bl] | xstormy16 | xtensa \
+	| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
 	| z8k)
 		basic_machine=$basic_machine-unknown
 		;;
@@ -317,13 +318,13 @@
 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \
 	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* \
 	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
-	| avr-* \
+	| avr-* | avr32-* \
 	| bfin-* | bs2000-* \
 	| c[123]* | c30-* | [cjt]90-* | c4x-* | c54x-* | c55x-* | c6x-* \
 	| clipper-* | craynv-* | cydra-* \
 	| d10v-* | d30v-* | dlx-* \
 	| elxsi-* \
-	| f30[01]-* | f700-* | fr30-* | frv-* | fx80-* \
+	| f30[01]-* | f700-* | fido-* | fr30-* | frv-* | fx80-* \
 	| h8300-* | h8500-* \
 	| hppa-* | hppa1.[01]-* | hppa2.0-* | hppa2.0[nw]-* | hppa64-* \
 	| i*86-* | i860-* | i960-* | ia64-* \
@@ -367,7 +368,7 @@
 	| tron-* \
 	| v850-* | v850e-* | vax-* \
 	| we32k-* \
-	| x86-* | x86_64-* | xps100-* | xscale-* | xscalee[bl]-* \
+	| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
 	| xstormy16-* | xtensa-* \
 	| ymp-* \
 	| z8k-*)
@@ -909,6 +910,10 @@
 	sb1el)
 		basic_machine=mipsisa64sb1el-unknown
 		;;
+	sde)
+		basic_machine=mipsisa32-sde
+		os=-elf
+		;;
 	sei)
 		basic_machine=mips-sei
 		os=-seiux
@@ -920,6 +925,9 @@
 		basic_machine=sh-hitachi
 		os=-hms
 		;;
+	sh5el)
+		basic_machine=sh5le-unknown
+		;;
 	sh64)
 		basic_machine=sh64-unknown
 		;;
@@ -1214,7 +1222,7 @@
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
-	      | -skyos* | -haiku* | -rdos*)
+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
@@ -1366,6 +1374,9 @@
 # system, and we'll never get to this point.
 
 case $basic_machine in
+        score-*)
+		os=-elf
+		;;
         spu-*)
 		os=-elf
 		;;
@@ -1406,6 +1417,9 @@
 	m68*-cisco)
 		os=-aout
 		;;
+        mep-*)
+		os=-elf
+		;;
 	mips*-cisco)
 		os=-elf
 		;;
diff --git a/configure.ac b/configure.ac
index bf7d8ae..8405a8a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 ## Process this file with autoconf to create configure. -*- autoconf -*-
-# Copyright 2001  Free Software Foundation, Inc.
+# Copyright 2001-2005, 2007  Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -25,7 +25,7 @@
 ## ------------------------ ##
 ## Autoconf initialisation. ##
 ## ------------------------ ##
-AC_INIT([libtool], [1.5.23a], [bug-libtool@gnu.org])
+AC_INIT([libtool], [1.5.23b], [bug-libtool@gnu.org])
 AC_CONFIG_SRCDIR([ltmain.in])
 
 
diff --git a/libltdl/Makefile.am b/libltdl/Makefile.am
index 969ed3d..2a1e701 100644
--- a/libltdl/Makefile.am
+++ b/libltdl/Makefile.am
@@ -18,7 +18,7 @@
 CLEANFILES = libltdl.la libltdlc.la
 
 libltdl_la_SOURCES = ltdl.c
-libltdl_la_LDFLAGS = -no-undefined -version-info 4:4:1
+libltdl_la_LDFLAGS = -no-undefined -version-info 4:5:1
 libltdl_la_LIBADD = $(LIBADD_DL)
 
 libltdlc_la_SOURCES = ltdl.c
diff --git a/libtool.m4 b/libtool.m4
index 3fad4a4..9072f5c 100644
--- a/libtool.m4
+++ b/libtool.m4
@@ -7,7 +7,7 @@
 ## unlimited permission to copy and/or distribute it, with or without
 ## modifications, as long as this notice is preserved.
 
-# serial 49 AC_PROG_LIBTOOL
+# serial 50 AC_PROG_LIBTOOL
 
 
 # AC_PROVIDE_IFELSE(MACRO-NAME, IF-PROVIDED, IF-NOT-PROVIDED)
diff --git a/ltdl.m4 b/ltdl.m4
index 1e835fa..f99f1b1 100644
--- a/ltdl.m4
+++ b/ltdl.m4
@@ -1,11 +1,11 @@
 ## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
-## Copyright (C) 1999-2000 Free Software Foundation, Inc.
+## Copyright (C) 1999-2006 Free Software Foundation, Inc.
 ##
 ## This file is free software; the Free Software Foundation gives
 ## unlimited permission to copy and/or distribute it, with or without
 ## modifications, as long as this notice is preserved.
 
-# serial 7 AC_LIB_LTDL
+# serial 8 AC_LIB_LTDL
 
 # AC_WITH_LTDL
 # ------------