<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+ <!-- Features we're currently flighting, but don't intend to ship in officially supported releases -->
+ <PropertyGroup Condition="'$(IsPrerelease)' == 'true'">
+ <FeatureDefaultInterfaces>true</FeatureDefaultInterfaces>
+ </PropertyGroup>
+
<PropertyGroup>
<DefineConstants Condition="'$(FeatureAppX)' == 'true'">$(DefineConstants);FEATURE_APPX</DefineConstants>
<DefineConstants Condition="'$(FeatureArrayStubAsIL)' == 'true'">$(DefineConstants);FEATURE_ARRAYSTUB_AS_IL</DefineConstants>
<DefineConstants Condition="'$(FeatureXplatEventSource)' == 'true'">$(DefineConstants);FEATURE_EVENTSOURCE_XPLAT</DefineConstants>
<DefineConstants Condition="'$(FeatureUseLcid)' == 'true'">$(DefineConstants);FEATURE_USE_LCID</DefineConstants>
<DefineConstants Condition="'$(FeatureWin32Registry)' == 'true'">$(DefineConstants);FEATURE_WIN32_REGISTRY</DefineConstants>
+ <DefineConstants Condition="'$(FeatureDefaultInterfaces)' == 'true'">$(DefineConstants);FEATURE_DEFAULT_INTERFACES</DefineConstants>
<DefineConstants Condition="'$(ProfilingSupportedBuild)' == 'true'">$(DefineConstants);PROFILING_SUPPORTED</DefineConstants>