Index: src/log4net.Tests/Context/LogicalThreadContextTest.cs
===================================================================
--- src/log4net.Tests/Context/LogicalThreadContextTest.cs	(revision 1710414)
+++ src/log4net.Tests/Context/LogicalThreadContextTest.cs	(working copy)
@@ -17,7 +17,7 @@
 //
 #endregion
 
-#if FRAMEWORK_4_5_OR_ABOVE
+#if HAS_ASYNC_AWAIT
 using System;
 using System.Threading.Tasks;
 using System.Linq;
Index: src/log4net.Tests/log4net.Tests.vs2010.csproj
===================================================================
--- src/log4net.Tests/log4net.Tests.vs2010.csproj	(revision 1710414)
+++ src/log4net.Tests/log4net.Tests.vs2010.csproj	(working copy)
@@ -72,7 +72,7 @@
     <CheckForOverflowUnderflow>false</CheckForOverflowUnderflow>
     <ConfigurationOverrideFile>
     </ConfigurationOverrideFile>
-    <DefineConstants>TRACE;DEBUG;DOTNET;FRAMEWORK_3_5_OR_ABOVE;FRAMEWORK_4_0_OR_ABOVE</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;DOTNET;FRAMEWORK_3_5_OR_ABOVE;FRAMEWORK_4_0_OR_ABOVE;HAS_TPL</DefineConstants>
     <DocumentationFile>
     </DocumentationFile>
     <DebugSymbols>true</DebugSymbols>
Index: src/log4net.Tests/log4net.Tests.vs2012.csproj
===================================================================
--- src/log4net.Tests/log4net.Tests.vs2012.csproj	(revision 1710414)
+++ src/log4net.Tests/log4net.Tests.vs2012.csproj	(working copy)
@@ -72,7 +72,7 @@
     <CheckForOverflowUnderflow>false</CheckForOverflowUnderflow>
     <ConfigurationOverrideFile>
     </ConfigurationOverrideFile>
-    <DefineConstants>TRACE;DEBUG;DOTNET;FRAMEWORK_3_5_OR_ABOVE;FRAMEWORK_4_0_OR_ABOVE;FRAMEWORK_4_5_OR_ABOVE</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;DOTNET;FRAMEWORK_3_5_OR_ABOVE;FRAMEWORK_4_0_OR_ABOVE;FRAMEWORK_4_5_OR_ABOVE;HAS_TPL;HAS_ASYNC_AWAIT</DefineConstants>
     <DocumentationFile>
     </DocumentationFile>
     <DebugSymbols>true</DebugSymbols>
Index: src/log4net/Appender/AsyncAppender.cs
===================================================================
--- src/log4net/Appender/AsyncAppender.cs	(revision 1710414)
+++ src/log4net/Appender/AsyncAppender.cs	(working copy)
@@ -19,7 +19,7 @@
 
 using System;
 using System.Collections.Generic;
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
 using System.Threading.Tasks;
 #else
 using System.Threading;
@@ -46,7 +46,7 @@
         /// </summary>
         public AsyncAppender()
         {
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
             logTask = new Task(() => { });
             logTask.Start();
 #endif
@@ -92,7 +92,7 @@
                 }
                 events.Add(loggingEvent);
             }
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
             logTask.ContinueWith(AsyncAppend);
 #else
             ThreadPool.QueueUserWorkItem(AsyncAppend, null);
@@ -122,7 +122,7 @@
                 }
                 events.AddRange(loggingEvents);
             }
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
             logTask.ContinueWith(AsyncAppend);
 #else
             ThreadPool.QueueUserWorkItem(AsyncAppend, null);
@@ -145,7 +145,7 @@
         {
             lock (lockObject)
             {
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
                 if (!closed)
                 {
                     logTask.Wait();
@@ -158,7 +158,7 @@
 
         private void AsyncAppend(object _ignored)
         {
-#if FRAMEWORK_4_0_OR_ABOVE // ContinueWith already ensures there is only one thread executing this method at a time
+#if HAS_TPL // ContinueWith already ensures there is only one thread executing this method at a time
             ForwardEvents();
 #else
             lock (lockObject)
@@ -213,7 +213,7 @@
         private readonly object lockObject = new object();
         private readonly List<LoggingEvent> events = new List<LoggingEvent>();
         private bool closed = false;
-#if FRAMEWORK_4_0_OR_ABOVE
+#if HAS_TPL
         private readonly Task logTask;
 #else
         private bool inLoggingLoop = false;