ProvideMultiplatformVersions.proj

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <SLPath>$(MSBuildExtensionsPath32)\..\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.0\Profile\$(TargetFrameworkProfile)</SLPath>
    <NETFwkPath>C:\Windows\Microsoft.NET\Framework\v4.0.30319</NETFwkPath>
    <MergedOutDir Condition="'$(MergedOutDir)'==''">$(ProjectDir)$(OutDir)</MergedOutDir>
	<RunMerge Condition="'$(RunMerge)'==''">OnOutputUpdated</RunMerge>
  </PropertyGroup>
   <Target Name="BeforeCompile">
        <PropertyGroup>
            <AssemblyTimestampBeforeCompile>%(IntermediateAssembly.ModifiedTime)</AssemblyTimestampBeforeCompile>
        </PropertyGroup>
    </Target>
    <Target Name="AfterCompile">
        <PropertyGroup>
            <AssemblyTimestampAfterCompile>%(IntermediateAssembly.ModifiedTime)</AssemblyTimestampAfterCompile>
        </PropertyGroup>
    </Target>

  <Target Name="DefineSLProperties">
    <PropertyGroup>
      <FwkLibPath>$(SLPath)</FwkLibPath>
      <Suffix>.dll</Suffix>
    </PropertyGroup>
  </Target>
  <Target Name="DefineNetProperties">
    <PropertyGroup>
      <FwkLibPath>$(NetFwkPath)</FwkLibPath>
      <Suffix>.dll</Suffix>
    </PropertyGroup>
  </Target>


  <Target Name="BuildPlatformVersion" Condition="'$(RunMerge)'!='OnOutputUpdated' or '$(AssemblyTimestampBeforeCompile)'!='$(AssemblyTimestampAfterCompile)'">
    <CreateItem Include="@(ReferencePath)" Condition="'%(CopyLocal)'=='false' and '$(FwkLibPath)\.'!='%(RootDir)%(Directory).'">
      <Output TaskParameter="Include" ItemName="libPaths" />
    </CreateItem>
    <CreateItem Include="@(ReferencePath)" Condition="'%(CopyLocal)'=='true'">
      <Output TaskParameter="Include" ItemName="IlmergeAssemblies" />
    </CreateItem>
    <Exec Command="&quot;$(ProjectDir)..\Dependencies\ILMerge\Ilmerge.exe&quot; /target:library /lib:&quot;$(FwkLibPath)&quot; @(libPaths->'&quot;/lib:%(RootDir)%(Directory).&quot;', ' ') &quot;/targetplatform:v2,$(FwkLibPath)&quot; &quot;/out:$(MergedOutDir)$(RootNamespace)$(Suffix)&quot; &quot;$(ProjectDir)@(IntermediateAssembly)&quot; @(IlmergeAssemblies->'&quot;%(FullPath)&quot;', ' ')"/> <!-- &quot;/log:$(ProjectDir)ilmerge.log&quot;" /> -->
    <Message Importance="High" Text="$(MSBuildProjectName) -&gt; $(RootNamespace)$(Suffix)" />
  </Target>

  <Target Name="BuildSLVersion" DependsOnTargets="DefineSLProperties;BuildPlatformVersion" />
  <Target Name="BuildNetVersion" DependsOnTargets="DefineNetProperties;BuildPlatformVersion" />
</Project>