USE_STL
The USE_STL macro is only needed if you are using the STL package.
If you are using this package, you should add the following line to your Sources file:
USE_STL=1
Otherwise you may encounter build errors that indicate that some file cannot be found (and the file name in question will have no extension).
Note The USE_STL might require that you enable structured exception handling, For more information, see USE_NATIVE_EH.
See Also
USE_IOSTREAM, USE_NATIVE_EH, STL_VER
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Build date: 5/3/2011