nugetrestore.targets.xml

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

    <PropertyGroup>
      <NuGetExe Condition="$(NuGetExe) == ''">nuget</NuGetExe>
      <NuGetSource Condition="$(NuGetSource) == ''">C:\nugetsource</NuGetSource>
    </PropertyGroup>
    <Target Name="BeforeBuild" Condition="'$(BuildingInsideVisualStudio)' == '' or '$(BuildingInsideVisualStudio)' == 'False'">
      <ItemGroup>
        <NuGetPackageConfigs Include="packages.config" />
      </ItemGroup>
      <Exec Command="$(NuGetExe) restore $(NuGetPackageConfigs) -o ..\packages -Source $(NuGetSource)" />
    </Target>
</Project>