--- a/src/Build/Definition/ProjectCollection.cs

+++ b/src/Build/Definition/ProjectCollection.cs

@@ -1754,7 +1754,11 @@ namespace Microsoft.Build.Evaluation

 #if FEATURE_WIN32_REGISTRY

                 ToolsetRegistryReader registryReader = null,

 #endif

+#if FEATURE_SYSTEM_CONFIGURATION

                 ToolsetConfigurationReader configReader = null

+#else

+                object configReader = null

+#endif

                 )

         {

             _toolsets = new Dictionary<string, Toolset>(StringComparer.OrdinalIgnoreCase);

--- a/src/Build/Definition/ToolsetReader.cs

+++ b/src/Build/Definition/ToolsetReader.cs

@@ -101,7 +101,11 @@ namespace Microsoft.Build.Evaluation

 #if FEATURE_WIN32_REGISTRY

             ToolsetRegistryReader registryReader,

 #endif

+#if FEATURE_SYSTEM_CONFIGURATION

             ToolsetConfigurationReader configurationReader,

+#else

+            object _configurationReader,

+#endif

             PropertyDictionary<ProjectPropertyInstance> environmentProperties,

             PropertyDictionary<ProjectPropertyInstance> globalProperties,

             ToolsetDefinitionLocations locations

@@ -120,6 +124,7 @@ namespace Microsoft.Build.Evaluation

             if ((locations & ToolsetDefinitionLocations.ConfigurationFile) == ToolsetDefinitionLocations.ConfigurationFile)

             {

+#if FEATURE_SYSTEM_CONFIGURATION

                 if (configurationReader == null)

                 {

                     configurationReader = new ToolsetConfigurationReader(environmentProperties, globalProperties);

@@ -129,6 +134,9 @@ namespace Microsoft.Build.Evaluation

                 defaultToolsVersionFromConfiguration = configurationReader.ReadToolsets(toolsets, globalProperties,

                     initialProperties, true /* accumulate properties */, out overrideTasksPathFromConfiguration,

                     out defaultOverrideToolsVersionFromConfiguration);

+#else

+                throw new InvalidOperationException("ToolsetDefinitionLocations.ConfigurationFile not supported");

+#endif

             }

             string defaultToolsVersionFromRegistry = null;