need System.Configuration references on recent Monos
diff --git a/log4net.build b/log4net.build
index 43b3ffd..e9ffe83 100644
--- a/log4net.build
+++ b/log4net.build
@@ -1276,6 +1276,7 @@
         </resources>
         <references>
           <include name="System.dll" />
+          <include name="System.Configuration.dll" />
           <include name="System.Data.dll" />
           <include name="System.Web.dll" />
           <include name="System.Xml.dll" />
@@ -1300,6 +1301,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
         <include name="System.Xml.dll" />
@@ -1323,6 +1325,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
         <include name="System.Xml.dll" />
@@ -1367,6 +1370,7 @@
         </resources>
         <references>
           <include name="System.dll" />
+          <include name="System.Configuration.dll" />
           <include name="System.Core.dll" />
           <include name="System.Data.dll" />
           <include name="System.Web.dll" />
@@ -1392,6 +1396,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Core.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
@@ -1416,6 +1421,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Core.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
@@ -1462,6 +1468,7 @@
         <references>
           <include name="System.dll" />
           <include name="System.Core.dll" />
+          <include name="System.Configuration.dll" />
           <include name="System.Data.dll" />
           <include name="System.Web.dll" />
           <include name="System.Xml.dll" />
@@ -1486,6 +1493,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Core.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
@@ -1510,6 +1518,7 @@
       </resources>
       <references>
         <include name="System.dll" />
+        <include name="System.Configuration.dll" />
         <include name="System.Core.dll" />
         <include name="System.Data.dll" />
         <include name="System.Web.dll" />
diff --git a/tests/nant.build b/tests/nant.build
index 22a31f1..0a3ad41 100644
--- a/tests/nant.build
+++ b/tests/nant.build
@@ -349,6 +349,7 @@
             <references defaultexcludes="true">
                 <!-- include name="mscorlib.dll" / -->
                 <include name="System.dll" />
+		<include name="System.Configuration.dll" />
                 <include name="System.Data.dll" />
                 <include name="System.Web.dll" />
                 <include name="System.Xml.dll" />
@@ -404,6 +405,7 @@
             <references defaultexcludes="true">
                 <!-- include name="mscorlib.dll" / -->
                 <include name="System.dll" />
+		<include name="System.Configuration.dll" />
                 <include name="System.Core.dll" />
                 <include name="System.Data.dll" />
                 <include name="System.Web.dll" />
@@ -460,6 +462,7 @@
             <references defaultexcludes="true">
                 <!-- include name="mscorlib.dll" / -->
                 <include name="System.dll" />
+		<include name="System.Configuration.dll" />
                 <include name="System.Core.dll" />
                 <include name="System.Data.dll" />
                 <include name="System.Web.dll" />