What is the command for building WSP from post-build event command line?

I’m adding one more image so that you can understand my exact requirement.

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I found the answer from here and it works for both SharePoint 2007 and 2010.
call “C:\Program Files\WSPTools\WSPBuilderExtensions\WSPBuilder.exe” -ProjectPath $(SolutionDir) -OutputPath $(SolutionDir) -SolutionPath $(SolutionDir)