diff --git a/CHANGES b/CHANGES
index 3a138d63b5..2a93f00219 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,8 @@
-1008.	[port]		libtool.m4, ltmain.sh from libtool-1.4.2
+1009.	[port]		OpenUNIX 8 support.  [RT #1728]
 
-1007.	[port]		config.guess, config.sub from autoconf-2.52
+1008.	[port]		libtool.m4, ltmain.sh from libtool-1.4.2.
+
+1007.	[port]		config.guess, config.sub from autoconf-2.52.
 
 1006.	[bug]		If a KEY RR was found missing during DNSSEC validation,
 			an assertion failure could subsequently be triggered
diff --git a/configure.in b/configure.in
index b627e8d007..62ca81006d 100644
--- a/configure.in
+++ b/configure.in
@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(AC_DIVERSION_NOTICE)dnl
 esyscmd([sed "s/^/# /" COPYRIGHT])dnl
 AC_DIVERT_POP()dnl
 
-AC_REVISION($Revision: 1.296 $)
+AC_REVISION($Revision: 1.297 $)
 
 AC_INIT(lib/dns/name.c)
 AC_PREREQ(2.13)
@@ -451,6 +451,10 @@ case $host in
 *-sco-sysv*uw*)
         # UnixWare
 	use_threads=false ;;
+*-*-sysv*UnixW*)
+	use_threads=false ;;
+*-*-sysv*OpenUNIX*)
+	use_threads=false ;;
 *-netbsd*)
 	# Socket I/O optimizations introduced in 9.2 expose a
 	# bug in unproven-pthreads; see PR #12650
@@ -612,6 +616,12 @@ then
 		*-sco-sysv*uw*)
 			AC_DEFINE(HAVE_UNIXWARE_SIGWAIT)
 			;;
+		*-*-sysv*UnixWare*)
+			AC_DEFINE(HAVE_UNIXWARE_SIGWAIT)
+			;;
+		*-*-sysv*OpenUNIX*)
+			AC_DEFINE(HAVE_UNIXWARE_SIGWAIT)
+			;;
 	esac
 
 	#
@@ -654,6 +664,14 @@ then
 			CC="$CC -Kthread"
 			CCOPT="$CCOPT -Kthread"
 			;;
+		*-*-sysv*UnixWare*)
+			CC="$CC -Kthread"
+			CCOPT="$CCOPT -Kthread"
+			;;
+		*-*-sysv*OpenUNIX*)
+			CC="$CC -Kthread"
+			CCOPT="$CCOPT -Kthread"
+			;;
 		esac
 	fi
 	ALWAYS_DEFINES="-D_REENTRANT"
@@ -746,6 +764,14 @@ else
                 # UnixWare
 		CC="$CC -w"
 		;;
+	*-*-sysv*UnixWare*)
+                # UnixWare
+		CC="$CC -w"
+		;;
+	*-*-sysv*OpenUNIX*)
+                # UnixWare
+		CC="$CC -w"
+		;;
 	esac
 fi
 
@@ -976,6 +1002,20 @@ case "$host" in
         ISC_PLATFORM_FIXIN6ISADDR="#define ISC_PLATFORM_FIXIN6ISADDR 1"
 	isc_netinetin6_hack="#include <netinet/in6.h>"
 	;;
+*-*-sysv*UnixWare*)
+        # UnixWare
+	ISC_PLATFORM_NEEDNETINETIN6H="#define ISC_PLATFORM_NEEDNETINETIN6H 1"
+	LWRES_PLATFORM_NEEDNETINETIN6H="#define LWRES_PLATFORM_NEEDNETINETIN6H 1"
+        ISC_PLATFORM_FIXIN6ISADDR="#define ISC_PLATFORM_FIXIN6ISADDR 1"
+	isc_netinetin6_hack="#include <netinet/in6.h>"
+	;;
+*-*-sysv*OpenUNIX*)
+        # UnixWare
+	ISC_PLATFORM_NEEDNETINETIN6H="#define ISC_PLATFORM_NEEDNETINETIN6H 1"
+	LWRES_PLATFORM_NEEDNETINETIN6H="#define LWRES_PLATFORM_NEEDNETINETIN6H 1"
+        ISC_PLATFORM_FIXIN6ISADDR="#define ISC_PLATFORM_FIXIN6ISADDR 1"
+	isc_netinetin6_hack="#include <netinet/in6.h>"
+	;;
 *)
 	ISC_PLATFORM_NEEDNETINETIN6H="#undef ISC_PLATFORM_NEEDNETINETIN6H"
 	LWRES_PLATFORM_NEEDNETINETIN6H="#undef LWRES_PLATFORM_NEEDNETINETIN6H"