USER_INCLUDES
Use the USER_INCLUDES macro to specify header files that are created during the build process.
Generally, you use the INCLUDES macro in your Sources file to indicate the location of your build headers.
There are times, however, when this macro will not be useful because some header files might not exist. For example, some header files are built as part of the build process.
Use the USER_INCLUDES macro to specify header files that are created during the build process. The Build utility will search for these header files, will not consider it an error if the files are not found, and will not perform dependency checking on them.
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Build date: 5/3/2011