/nostdlib[+ | -]
Mscorlib.dll defines the entire System namespace. Use this option if you want to define or create your own System namespace and objects.
If you specify /nostdlib or /nostdlib+, the standard libraries mscorlib.dll and Microsoft.VisualBasic.dll will not be imported into your program and you must manually add references to MSCorLib.dll and Microsoft.VisualBasic.dll using the /reference option. The default for this option is /nostdlib -.
Compile t2.vb
but do not load standard libraries:
vbc t2.vb /nostdlib