/X
This option 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 Additional Include Directories (/Idirectory) option.
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
Compiler Options | Setting Compiler Options