diff --git a/RELNOTES b/RELNOTES
index 84be87fb..f5c02053 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -54,6 +54,13 @@ by Eric Young (eay@cryptsoft.com).
 
 			Changes since 4.3.3
 
+- Added dhcpv6 and delayed-ack to settings listed in the "Features:"
+  section of the configure script output.  Additionally, all of the
+  features reported on will now always show either a "yes" or "no"
+  value.  Prior to this features left to their default setting would
+  not show a value.
+  [ISC-Bugs #40381]
+
 - Added the lease address to the end of the debug level log message
   emitted when an existing lease is renewed within the dhcp-cache-threshold.
   Thanks to Nathan Neulinger at Missouri S&T for suggesting the change.
diff --git a/configure b/configure
index f8f1acaf..81d0751d 100755
--- a/configure
+++ b/configure
@@ -5300,6 +5300,7 @@ fi
 
 # Failover is on by default, so define if it is not explicitly disabled.
 if test "$enable_failover" != "no"; then
+    enable_failover="yes"
 
 $as_echo "#define FAILOVER_PROTOCOL 1" >>confdefs.h
 
@@ -5313,6 +5314,7 @@ fi
 
 # execute() is on by default, so define if it is not explicitly disabled.
 if test "$enable_execute" != "no" ; then
+    enable_execute="yes"
 
 $as_echo "#define ENABLE_EXECUTE 1" >>confdefs.h
 
@@ -5341,6 +5343,8 @@ if test "$enable_delayed_ack" = "yes"; then
 
 $as_echo "#define DELAYED_ACK 1" >>confdefs.h
 
+else
+    enable_delayed_ack="no"
 fi
 
 # DHCPv6 optional compile-time feature.
@@ -5348,9 +5352,10 @@ fi
 if test "${enable_dhcpv6+set}" = set; then :
   enableval=$enable_dhcpv6;
 fi
-
+,
 # DHCPv6 is on by default, so define if it is not explicitly disabled.
 if test "$enable_dhcpv6" != "no"; then
+    enable_dhcpv6="yes"
 
 $as_echo "#define DHCPv6 1" >>confdefs.h
 
@@ -5448,6 +5453,8 @@ if test "$enable_binary_leases" = "yes"; then
 
 $as_echo "#define BINARY_LEASES 1" >>confdefs.h
 
+else
+    enable_binary_leases="no"
 fi
 
 # Testing section
@@ -8486,6 +8493,8 @@ Features:
   failover:      $enable_failover
   execute:       $enable_execute
   binary-leases: $enable_binary_leases
+  dhcpv6:        $enable_dhcpv6
+  delayed-ack:   $enable_delayed_ack
 
 Developer:
   ATF unittests : $atf_path
diff --git a/configure.ac b/configure.ac
index 3f1415b4..ce1ddd5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,6 +91,7 @@ AC_ARG_ENABLE(failover,
 	AS_HELP_STRING([--enable-failover],[enable support for failover (default is yes)]))
 # Failover is on by default, so define if it is not explicitly disabled.
 if test "$enable_failover" != "no"; then
+    enable_failover="yes"
 	AC_DEFINE([FAILOVER_PROTOCOL], [1],
 		  [Define to include Failover Protocol support.])
 fi
@@ -100,6 +101,7 @@ AC_ARG_ENABLE(execute,
 	AS_HELP_STRING([--enable-execute],[enable support for execute() in config (default is yes)]))
 # execute() is on by default, so define if it is not explicitly disabled.
 if test "$enable_execute" != "no" ; then
+    enable_execute="yes"
 	AC_DEFINE([ENABLE_EXECUTE], [1],
 		  [Define to include execute() config language support.])
 fi
@@ -119,13 +121,16 @@ AC_ARG_ENABLE(delayed_ack,
 if test "$enable_delayed_ack" = "yes"; then
 	AC_DEFINE([DELAYED_ACK], [1],
 		  [Define to queue multiple DHCPACK replies per fsync.])
+else
+    enable_delayed_ack="no"
 fi
 
 # DHCPv6 optional compile-time feature.
 AC_ARG_ENABLE(dhcpv6,
-	AS_HELP_STRING([--enable-dhcpv6],[enable support for DHCPv6 (default is yes)]))
+	AS_HELP_STRING([--enable-dhcpv6],[enable support for DHCPv6 (default is yes)])),
 # DHCPv6 is on by default, so define if it is not explicitly disabled.
 if test "$enable_dhcpv6" != "no"; then
+    enable_dhcpv6="yes"
 	AC_DEFINE([DHCPv6], [1], 
 		  [Define to 1 to include DHCPv6 support.])
 fi
@@ -194,6 +199,8 @@ AC_ARG_ENABLE(binary_leases,
 if test "$enable_binary_leases" = "yes"; then
 	AC_DEFINE([BINARY_LEASES], [1],
 		  [Define to support binary insertion of leases into queues.])
+else
+    enable_binary_leases="no"
 fi
 
 # Testing section
@@ -750,6 +757,8 @@ Features:
   failover:      $enable_failover
   execute:       $enable_execute
   binary-leases: $enable_binary_leases
+  dhcpv6:        $enable_dhcpv6
+  delayed-ack:   $enable_delayed_ack
 
 Developer:
   ATF unittests : $atf_path