diff --git a/CHANGES b/CHANGES
index 6f0768a267..1e7d0cb6d6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -43,7 +43,9 @@
 1811.	[func]		Preserve the case of domain names in rdata during
 			zone transfers. [RT #13547]
 
-1810.	[placeholder]	rt13212
+1810.	[bug]		configure, lib/bind/configure make different default
+			decisions about whether to do a threaded build.
+			[RT #13212]
 
 1809.	[bug]		"make distclean" failed for libbind if the platform
 			is not supported.
diff --git a/config.threads.in b/config.threads.in
new file mode 100644
index 0000000000..f2816c447f
--- /dev/null
+++ b/config.threads.in
@@ -0,0 +1,152 @@
+#
+# Begin pthreads checking.
+#
+# First, decide whether to use multithreading or not.
+#
+# Enable multithreading by default on systems where it is known
+# to work well, and where debugging of multithreaded programs
+# is supported.
+#
+
+AC_MSG_CHECKING(whether to build with thread support)
+
+case $host in
+*-dec-osf*)
+	use_threads=true ;;
+[*-solaris2.[0-6]])
+	# Thread signals are broken on Solaris 2.6; they are sometimes
+	# delivered to the wrong thread.
+	use_threads=false ;;
+*-solaris*)
+	use_threads=true ;;
+*-ibm-aix*)
+	use_threads=true ;;
+*-hp-hpux10*)
+	use_threads=false ;;
+*-hp-hpux11*)
+	use_threads=true ;;
+*-sgi-irix*)
+	use_threads=true ;;
+*-sco-sysv*uw*|*-*-sysv*UnixWare*)
+        # UnixWare
+	use_threads=false ;;
+*-*-sysv*OpenUNIX*)
+        # UnixWare
+	use_threads=true ;;
+*-netbsd*)
+	if test -r /usr/lib/libpthread.so ; then
+	    use_threads=true
+	else
+	    # Socket I/O optimizations introduced in 9.2 expose a
+	    # bug in unproven-pthreads; see PR #12650
+	    use_threads=false
+	fi
+	;;
+*-openbsd*)
+	# OpenBSD users have reported that named dumps core on
+	# startup when built with threads.
+	use_threads=false ;;
+*-freebsd*)
+	use_threads=false ;;
+*-bsdi[234]*)
+	# Thread signals do not work reliably on some versions of BSD/OS.
+	use_threads=false ;;
+*-bsdi5*)
+	use_threads=true ;;
+*-linux*)
+   	# Threads are disabled on Linux by default because most
+	# Linux kernels produce unusable core dumps from multithreaded
+	# programs, and because of limitations in setuid().
+	use_threads=false ;;	
+*)
+	use_threads=false ;;
+esac
+
+AC_ARG_ENABLE(threads,
+	[  --enable-threads	enable multithreading])
+case "$enable_threads" in
+	yes)
+		use_threads=true
+		;;
+	no)
+		use_threads=false
+		;;
+	'')
+		# Use system-dependent default
+		;;
+	*)
+	    	AC_MSG_ERROR([--enable-threads takes yes or no])
+		;;
+esac
+
+if $use_threads
+then
+	AC_MSG_RESULT(yes)
+else
+	AC_MSG_RESULT(no)	
+fi
+
+if $use_threads
+then
+	#
+	# Search for / configure pthreads in a system-dependent fashion.
+	#
+	case "$host" in
+	  *-netbsd*)
+		# NetBSD has multiple pthreads implementations.	 The
+		# recommended one to use is "unproven-pthreads".  The
+		# older "mit-pthreads" may also work on some NetBSD
+		# versions.  The PTL2 thread library does not
+		# currently work with bind9, but can be chosen with
+		# the --with-ptl2 option for those who wish to
+		# experiment with it.
+		CC="gcc"
+		AC_MSG_CHECKING(which NetBSD thread library to use)
+
+		AC_ARG_WITH(ptl2,
+[  --with-ptl2		on NetBSD, use the ptl2 thread library (experimental)],
+		    use_ptl2="$withval", use_ptl2="no")
+
+		: ${LOCALBASE:=/usr/pkg}
+
+		if test "X$use_ptl2" = "Xyes"
+		then
+			AC_MSG_RESULT(PTL2)
+			AC_MSG_WARN(
+[linking with PTL2 is highly experimental and not expected to work])
+			CC=ptlgcc
+		else
+			if test -r /usr/lib/libpthread.so
+			then
+				AC_MSG_RESULT(native)
+				LIBS="-lpthread $LIBS"
+			else
+				if test ! -d $LOCALBASE/pthreads
+				then
+					AC_MSG_RESULT(none)
+					AC_MSG_ERROR("could not find thread libraries")
+				fi
+
+				if $use_threads
+				then
+					AC_MSG_RESULT(mit-pthreads/unproven-pthreads)
+					pkg="$LOCALBASE/pthreads"
+					lib1="-L$pkg/lib -Wl,-R$pkg/lib"
+					lib2="-lpthread -lm -lgcc -lpthread"
+					LIBS="$lib1 $lib2 $LIBS"
+					CPPFLAGS="$CPPFLAGS -I$pkg/include"
+					STD_CINCLUDES="$STD_CINCLUDES -I$pkg/include"
+				fi
+			fi
+		fi
+		;;
+		*)
+			AC_CHECK_LIB(pthread, pthread_create,,
+				AC_CHECK_LIB(pthread, __pthread_create,,
+				AC_CHECK_LIB(pthread, __pthread_create_system,,
+				AC_CHECK_LIB(c_r, pthread_create,,
+				AC_CHECK_LIB(c, pthread_create,,
+				AC_MSG_ERROR("could not find thread libraries"))))))
+		;;
+	esac
+fi
diff --git a/configure.in b/configure.in
index 80d6b260ab..87b8bf6e76 100644
--- a/configure.in
+++ b/configure.in
@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(1)dnl
 esyscmd([sed "s/^/# /" COPYRIGHT])dnl
 AC_DIVERT_POP()dnl
 
-AC_REVISION($Revision: 1.373 $)
+AC_REVISION($Revision: 1.374 $)
 
 AC_INIT(lib/dns/name.c)
 AC_PREREQ(2.13)
@@ -608,158 +608,7 @@ esac
 #
 AC_CHECK_FUNC(arc4random, AC_DEFINE(HAVE_ARC4RANDOM))
 
-#
-# Begin pthreads checking.
-#
-# First, decide whether to use multithreading or not.
-#
-# Enable multithreading by default on systems where it is known
-# to work well, and where debugging of multithreaded programs
-# is supported.
-#
-
-AC_MSG_CHECKING(whether to build with thread support)
-
-case $host in
-*-dec-osf*)
-	use_threads=true ;;
-[*-solaris2.[0-6]])
-	# Thread signals are broken on Solaris 2.6; they are sometimes
-	# delivered to the wrong thread.
-	use_threads=false ;;
-*-solaris*)
-	use_threads=true ;;
-*-ibm-aix*)
-	use_threads=true ;;
-*-hp-hpux10*)
-	use_threads=false ;;
-*-hp-hpux11*)
-	use_threads=true ;;
-*-sgi-irix*)
-	use_threads=true ;;
-*-sco-sysv*uw*|*-*-sysv*UnixWare*)
-        # UnixWare
-	use_threads=false ;;
-*-*-sysv*OpenUNIX*)
-        # UnixWare
-	use_threads=true ;;
-*-netbsd*)
-	if test -r /usr/lib/libpthread.so ; then
-	    use_threads=true
-	else
-	    # Socket I/O optimizations introduced in 9.2 expose a
-	    # bug in unproven-pthreads; see PR #12650
-	    use_threads=false
-	fi
-	;;
-*-openbsd*)
-	# OpenBSD users have reported that named dumps core on
-	# startup when built with threads.
-	use_threads=false ;;
-*-freebsd*)
-	use_threads=false ;;
-*-bsdi[234]*)
-	# Thread signals do not work reliably on some versions of BSD/OS.
-	use_threads=false ;;
-*-bsdi5*)
-	use_threads=true ;;
-*-linux*)
-   	# Threads are disabled on Linux by default because most
-	# Linux kernels produce unusable core dumps from multithreaded
-	# programs, and because of limitations in setuid().
-	use_threads=false ;;	
-*)
-	use_threads=false ;;
-esac
-
-AC_ARG_ENABLE(threads,
-	[  --enable-threads	enable multithreading])
-case "$enable_threads" in
-	yes)
-		use_threads=true
-		;;
-	no)
-		use_threads=false
-		;;
-	'')
-		# Use system-dependent default
-		;;
-	*)
-	    	AC_MSG_ERROR([--enable-threads takes yes or no])
-		;;
-esac
-
-if $use_threads
-then
-	AC_MSG_RESULT(yes)
-else
-	AC_MSG_RESULT(no)	
-fi
-
-if $use_threads
-then
-	#
-	# Search for / configure pthreads in a system-dependent fashion.
-	#
-	case "$host" in
-	  *-netbsd*)
-		# NetBSD has multiple pthreads implementations.	 The
-		# recommended one to use is "unproven-pthreads".  The
-		# older "mit-pthreads" may also work on some NetBSD
-		# versions.  The PTL2 thread library does not
-		# currently work with bind9, but can be chosen with
-		# the --with-ptl2 option for those who wish to
-		# experiment with it.
-		CC="gcc"
-		AC_MSG_CHECKING(which NetBSD thread library to use)
-
-		AC_ARG_WITH(ptl2,
-[  --with-ptl2		on NetBSD, use the ptl2 thread library (experimental)],
-		    use_ptl2="$withval", use_ptl2="no")
-
-		: ${LOCALBASE:=/usr/pkg}
-
-		if test "X$use_ptl2" = "Xyes"
-		then
-			AC_MSG_RESULT(PTL2)
-			AC_MSG_WARN(
-[linking with PTL2 is highly experimental and not expected to work])
-			CC=ptlgcc
-		else
-			if test -r /usr/lib/libpthread.so
-			then
-				AC_MSG_RESULT(native)
-				LIBS="-lpthread $LIBS"
-			else
-				if test ! -d $LOCALBASE/pthreads
-				then
-					AC_MSG_RESULT(none)
-					AC_MSG_ERROR("could not find thread libraries")
-				fi
-
-				if $use_threads
-				then
-					AC_MSG_RESULT(mit-pthreads/unproven-pthreads)
-					pkg="$LOCALBASE/pthreads"
-					lib1="-L$pkg/lib -Wl,-R$pkg/lib"
-					lib2="-lpthread -lm -lgcc -lpthread"
-					LIBS="$lib1 $lib2 $LIBS"
-					CPPFLAGS="$CPPFLAGS -I$pkg/include"
-					STD_CINCLUDES="$STD_CINCLUDES -I$pkg/include"
-				fi
-			fi
-		fi
-		;;
-		*)
-			AC_CHECK_LIB(pthread, pthread_create,,
-				AC_CHECK_LIB(pthread, __pthread_create,,
-				AC_CHECK_LIB(pthread, __pthread_create_system,,
-				AC_CHECK_LIB(c_r, pthread_create,,
-				AC_CHECK_LIB(c, pthread_create,,
-				AC_MSG_ERROR("could not find thread libraries"))))))
-		;;
-	esac
-fi
+sinclude(config.threads.in)dnl
 
 if $use_threads
 then
@@ -884,7 +733,6 @@ fi
 
 AC_SUBST(ALWAYS_DEFINES)
 AC_SUBST(ISC_PLATFORM_USETHREADS)
-
 ISC_THREAD_DIR=$thread_dir
 AC_SUBST(ISC_THREAD_DIR)
 
diff --git a/lib/bind/configure.in b/lib/bind/configure.in
index 19a8fb9ea5..6017dcbfd4 100644
--- a/lib/bind/configure.in
+++ b/lib/bind/configure.in
@@ -13,7 +13,7 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-AC_REVISION($Revision: 1.99 $)
+AC_REVISION($Revision: 1.100 $)
 
 AC_INIT(resolv/herror.c)
 AC_PREREQ(2.13)
@@ -315,86 +315,7 @@ case "$use_randomdev" in
 		;;
 esac
 
-#
-# Begin pthreads checking.
-#
-# First, decide whether to use multithreading or not.
-#
-AC_MSG_CHECKING(whether to look for thread support)
-AC_ARG_ENABLE(threads,
-	[  --disable-threads	disable multithreading])
-case "$enable_threads" in
-	yes|'')
-		AC_MSG_RESULT(yes)
-		use_threads=true
-		;;
-	no)
-		AC_MSG_RESULT(no)	
-		use_threads=false
-		;;
-	*)
-	    	AC_MSG_ERROR([--enable-threads takes yes or no])
-		;;
-esac
-
-if $use_threads
-then
-	#
-	# Search for / configure pthreads in a system-dependent fashion.
-	#
-	case "$host" in
-	  *-netbsd*)
-		# NetBSD has multiple pthreads implementations.	 The
-		# recommended one to use is "unproven-pthreads".  The
-		# older "mit-pthreads" may also work on some NetBSD
-		# versions.  The PTL2 thread library does not
-		# currently work with bind9, but can be chosen with
-		# the --with-ptl2 option for those who wish to
-		# experiment with it.
-		CC="gcc"
-		AC_MSG_CHECKING(which NetBSD thread library to use)
-
-		AC_ARG_WITH(ptl2,
-[  --with-ptl2		on NetBSD, use the ptl2 thread library (experimental)],
-		    use_ptl2="$withval", use_ptl2="no")
-
-		: ${LOCALBASE:=/usr/pkg}
-
-		if test "X$use_ptl2" = "Xyes"
-		then
-			AC_MSG_RESULT(PTL2)
-			AC_MSG_WARN(
-[linking with PTL2 is highly experimental and not expected to work])
-			CC=ptlgcc
-		else
-			if test ! -d $LOCALBASE/pthreads
-			then
-				AC_MSG_RESULT(none)
-				use_threads=false
-			fi
-
-			if $use_threads
-			then
-				AC_MSG_RESULT(mit-pthreads/unproven-pthreads)
-				pkg="$LOCALBASE/pthreads"
-				lib1="-L$pkg/lib -Wl,-R$pkg/lib"
-				lib2="-lpthread -lm -lgcc -lpthread"
-				LIBS="$lib1 $lib2 $LIBS"
-				CPPFLAGS="$CPPFLAGS -I$pkg/include"
-				STD_CINCLUDES="$STD_CINCLUDES -I$pkg/include"
-			fi
-		fi
-		;;
-		*)
-			AC_CHECK_LIB(pthread, pthread_create,,
-				AC_CHECK_LIB(pthread, __pthread_create,,
-				AC_CHECK_LIB(pthread, __pthread_create_system,,
-				AC_CHECK_LIB(c_r, pthread_create,,
-				AC_CHECK_LIB(c, pthread_create,,
-				use_threads=false)))))
-		;;
-	esac
-fi
+sinclude(config.threads.in)dnl
 
 if $use_threads
 then
@@ -520,8 +441,6 @@ else
 	thread_dir=nothreads
 fi
 
-AC_CHECK_FUNC(strlcat, AC_DEFINE(HAVE_STRLCAT))
-
 AC_SUBST(ALWAYS_DEFINES)
 AC_SUBST(DO_PTHREADS)
 AC_SUBST(WANT_IRS_THREADSGR_OBJS)
@@ -529,6 +448,8 @@ AC_SUBST(WANT_IRS_THREADSPW_OBJS)
 AC_SUBST(WANT_IRS_THREADS_OBJS)
 AC_SUBST(WANT_THREADS_OBJS)
 
+AC_CHECK_FUNC(strlcat, AC_DEFINE(HAVE_STRLCAT))
+
 AC_CHECK_FUNC(if_nametoindex,
 	[USE_IFNAMELINKID="#define USE_IFNAMELINKID 1"],
 	[USE_IFNAMELINKID="#undef USE_IFNAMELINKID"])