/X - Ignore Standard Include Directory (Windows CE 5.0)
This option prevents the compiler from searching the standard directories for include files. When the compiler encounters the /X option, it does not search the current directory or any directories specified in the INCLUDE environment variable.
You can use this option with the /I option to define the location of include files that have the same names as include files found in the excluded directories.
See Also
Compiler Options | /I - Search Directory for Include Files
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