msbuild - how to set environment variable EnableNuGetPackageRestore to true?

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MVC

MSBuild

NuGet

I am writing MSbuild scripts to automate my build process without using visual studio for building my application. Recently stuck up with this error

"

 $(projectpath)\.nuget\nuget.targets(93,9): error : Packag
e restore is disabled by default. To give consent, open the Visual Studio Optio
ns dialog, click on Package Manager node and check 'Allow NuGet to download mis
sing packages during build.' You can also give consent by setting the environme
nt variable 'EnableNuGetPackageRestore' to 'true'.

"

I have tried


1) I have created a custom task which sets the environment variable to true - not working.
2) Tried executing "$(NugetRestore)\NuGet.exe" restore "%(Solution.Identity)" - not working - got error code 1 from nuget.
3) In the Nuget.targes set the RestorePackages to true - not working.

Can anybody help?

Thanks in advance