Edit C:\Windows\Microsoft.NET\Framework\v3.5\SqlServer.targets

<!--
***********************************************************************************************
SQLServer.targets

WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
          created a backup copy.  Incorrect changes to this file will make it
          impossible to load or build your projects from the command-line or the IDE.

Copyright (C) Microsoft Corporation. All rights reserved.
***********************************************************************************************
-->

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <PropertyGroup>
        <ResolveAssemblyReferencesDependsOn>$(ResolveAssemblyReferencesDependsOn);ResolveSQLCLRReferences</ResolveAssemblyReferencesDependsOn>
        <LoadTimeSensitiveTargets>
            $(LoadTimeSensitiveTargets);
            ResolveSQLCLRReferences;
        </LoadTimeSensitiveTargets>
    </PropertyGroup>

<Target
        Name="ResolveSQLCLRReferences"
        Condition="'@(Reference)'!=''"
        DependsOnTargets="$(ResolveSQLCLRReferencesDependsOn)"
        >

<PropertyGroup>
        <ProjectFlavor>SQL Server</ProjectFlavor>
    </PropertyGroup>

</Project>

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