diff --git a/config.h.in b/config.h.in
index ff549384bd..b820f10dfd 100644
--- a/config.h.in
+++ b/config.h.in
@@ -15,6 +15,9 @@
 /* Define if you can safely include both <sys/time.h> and <time.h>.  */
 #undef TIME_WITH_SYS_TIME
 
+/* define on DEC OSF to enable 4.4BSD style sa_len support */
+#undef _SOCKADDR_LEN
+
 /* define if your system needs pthread_init() before using pthreads */
 #undef NEED_PTHREAD_INIT
 
@@ -30,6 +33,9 @@
 /* define if catgets() is available */
 #undef HAVE_CATGETS
 
+/* Define if you have the NET_RT_IFLIST sysctl variable. */
+#undef HAVE_IFLIST_SYSCTL
+
 /* Define if you have the <fcntl.h> header file.  */
 #undef HAVE_FCNTL_H
 
@@ -53,6 +59,3 @@
 
 /* Define if you have the socket library (-lsocket).  */
 #undef HAVE_LIBSOCKET
-
-/* Define if you have the NET_RT_IFLIST sysctl variable. */
-#undef HAVE_IFLIST_SYSCTL
diff --git a/configure b/configure
index 2c05af1fe1..97e67058a4 100755
--- a/configure
+++ b/configure
@@ -2056,14 +2056,18 @@ fi
 
 case "$host" in
 	*-dec-osf*)
-										;;
+								cat >> confdefs.h <<\EOF
+#define _SOCKADDR_LEN 1
+EOF
+
+		;;
 esac
 
 
 echo $ac_n "checking for sa_len in struct sockaddr""... $ac_c" 1>&6
-echo "configure:2065: checking for sa_len in struct sockaddr" >&5
+echo "configure:2069: checking for sa_len in struct sockaddr" >&5
 cat > conftest.$ac_ext <<EOF
-#line 2067 "configure"
+#line 2071 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -2072,7 +2076,7 @@ int main() {
 struct sockaddr sa; sa.sa_len = 0; return (0);
 ; return 0; }
 EOF
-if { (eval echo configure:2076: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2080: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   echo "$ac_t""yes" 1>&6
 	ISC_NET_HAVESALEN="#define ISC_NET_HAVESALEN 1"
@@ -2088,9 +2092,9 @@ rm -f conftest*
 
 
 echo $ac_n "checking for interface list sysctl""... $ac_c" 1>&6
-echo "configure:2092: checking for interface list sysctl" >&5
+echo "configure:2096: checking for interface list sysctl" >&5
 cat > conftest.$ac_ext <<EOF
-#line 2094 "configure"
+#line 2098 "configure"
 #include "confdefs.h"
 
 #include <sys/param.h>
@@ -2197,7 +2201,7 @@ else
 fi
 
 echo $ac_n "checking build system type""... $ac_c" 1>&6
-echo "configure:2201: checking build system type" >&5
+echo "configure:2205: checking build system type" >&5
 
 build_alias=$build
 case "$build_alias" in
@@ -2226,7 +2230,7 @@ ac_prog=ld
 if test "$ac_cv_prog_gcc" = yes; then
   # Check if gcc -print-prog-name=ld gives a path.
   echo $ac_n "checking for ld used by GCC""... $ac_c" 1>&6
-echo "configure:2230: checking for ld used by GCC" >&5
+echo "configure:2234: checking for ld used by GCC" >&5
   ac_prog=`($CC -print-prog-name=ld) 2>&5`
   case "$ac_prog" in
     # Accept absolute paths.
@@ -2250,10 +2254,10 @@ echo "configure:2230: checking for ld used by GCC" >&5
   esac
 elif test "$with_gnu_ld" = yes; then
   echo $ac_n "checking for GNU ld""... $ac_c" 1>&6
-echo "configure:2254: checking for GNU ld" >&5
+echo "configure:2258: checking for GNU ld" >&5
 else
   echo $ac_n "checking for non-GNU ld""... $ac_c" 1>&6
-echo "configure:2257: checking for non-GNU ld" >&5
+echo "configure:2261: checking for non-GNU ld" >&5
 fi
 if eval "test \"`echo '$''{'ac_cv_path_LD'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -2289,7 +2293,7 @@ fi
 test -z "$LD" && { echo "configure: error: no acceptable ld found in \$PATH" 1>&2; exit 1; }
 
 echo $ac_n "checking if the linker ($LD) is GNU ld""... $ac_c" 1>&6
-echo "configure:2293: checking if the linker ($LD) is GNU ld" >&5
+echo "configure:2297: checking if the linker ($LD) is GNU ld" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gnu_ld'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2305,7 +2309,7 @@ echo "$ac_t""$ac_cv_prog_gnu_ld" 1>&6
 
 
 echo $ac_n "checking for BSD-compatible nm""... $ac_c" 1>&6
-echo "configure:2309: checking for BSD-compatible nm" >&5
+echo "configure:2313: checking for BSD-compatible nm" >&5
 if eval "test \"`echo '$''{'ac_cv_path_NM'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2342,7 +2346,7 @@ echo "$ac_t""$NM" 1>&6
 
 
 echo $ac_n "checking whether ln -s works""... $ac_c" 1>&6
-echo "configure:2346: checking whether ln -s works" >&5
+echo "configure:2350: checking whether ln -s works" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_LN_S'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2386,8 +2390,8 @@ test x"$silent" = xyes && libtool_flags="$libtool_flags --silent"
 case "$host" in
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 2390 "configure"' > conftest.$ac_ext
-  if { (eval echo configure:2391: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  echo '#line 2394 "configure"' > conftest.$ac_ext
+  if { (eval echo configure:2395: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
     case "`/usr/bin/file conftest.o`" in
     *32-bit*)
       LD="${LD-ld} -32"
@@ -2408,19 +2412,19 @@ case "$host" in
   SAVE_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -belf"
   echo $ac_n "checking whether the C compiler needs -belf""... $ac_c" 1>&6
-echo "configure:2412: checking whether the C compiler needs -belf" >&5
+echo "configure:2416: checking whether the C compiler needs -belf" >&5
 if eval "test \"`echo '$''{'lt_cv_cc_needs_belf'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2417 "configure"
+#line 2421 "configure"
 #include "confdefs.h"
 
 int main() {
 
 ; return 0; }
 EOF
-if { (eval echo configure:2424: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2428: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   lt_cv_cc_needs_belf=yes
 else
@@ -2535,9 +2539,9 @@ esac
 
 
 echo $ac_n "checking for IPv6 structures""... $ac_c" 1>&6
-echo "configure:2539: checking for IPv6 structures" >&5
+echo "configure:2543: checking for IPv6 structures" >&5
 cat > conftest.$ac_ext <<EOF
-#line 2541 "configure"
+#line 2545 "configure"
 #include "confdefs.h"
 
 #include <sys/types.h>
@@ -2547,7 +2551,7 @@ int main() {
 struct sockaddr_in6 sin6; return (0);
 ; return 0; }
 EOF
-if { (eval echo configure:2551: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:2555: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   echo "$ac_t""yes" 1>&6
 	ISC_NET_HAVEIPV6="#define ISC_NET_HAVEIPV6 1"
@@ -2570,12 +2574,12 @@ rm -f conftest*
 
 
 echo $ac_n "checking for inet_ntop""... $ac_c" 1>&6
-echo "configure:2574: checking for inet_ntop" >&5
+echo "configure:2578: checking for inet_ntop" >&5
 if eval "test \"`echo '$''{'ac_cv_func_inet_ntop'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2579 "configure"
+#line 2583 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char inet_ntop(); below.  */
@@ -2598,7 +2602,7 @@ inet_ntop();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2602: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2606: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_inet_ntop=yes"
 else
@@ -2622,12 +2626,12 @@ ISC_EXTRA_OBJS="$ISC_EXTRA_OBJS inet_ntop.$O"
 fi
 
 echo $ac_n "checking for inet_pton""... $ac_c" 1>&6
-echo "configure:2626: checking for inet_pton" >&5
+echo "configure:2630: checking for inet_pton" >&5
 if eval "test \"`echo '$''{'ac_cv_func_inet_pton'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2631 "configure"
+#line 2635 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char inet_pton(); below.  */
@@ -2650,7 +2654,7 @@ inet_pton();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2654: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2658: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_inet_pton=yes"
 else
@@ -2674,12 +2678,12 @@ ISC_EXTRA_OBJS="$ISC_EXTRA_OBJS inet_pton.$O"
 fi
 
 echo $ac_n "checking for inet_aton""... $ac_c" 1>&6
-echo "configure:2678: checking for inet_aton" >&5
+echo "configure:2682: checking for inet_aton" >&5
 if eval "test \"`echo '$''{'ac_cv_func_inet_aton'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2683 "configure"
+#line 2687 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char inet_aton(); below.  */
@@ -2702,7 +2706,7 @@ inet_aton();
 
 ; return 0; }
 EOF
-if { (eval echo configure:2706: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2710: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_inet_aton=yes"
 else