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/X (Ignore Standard Include Paths)
Prevents the compiler from searching for include files in directories specified in the PATH and INCLUDE environment variables.
You can use this option with the directory) option.(/I
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see.
Click the C/C++ folder.
Click the Preprocessor property page.
Modify the Ignore Standard Include Path property.
To set this compiler option programmatically
In the following command, /X tells the compiler to ignore locations specified by the PATH and INCLUDE environment variables, and /I specifies the directory in which to look for include files:
CL /X /I \ALT\INCLUDE MAIN.C