DEBUG_CRTS
The DEBUG_CRTS macro causes the Build utility to use the debug versions of the C run-time (CRT) libraries and Microsoft Foundation Classes (MFC) should be used.
Whether you build a checked or free product, the Build utility usually links against the retail run-time libraries and the retail MFC.
If you want to link against the debug MFC and the debug run-time libraries, specify the following in your Sources file or set it in your environment variables before you build:
DEBUG_CRTS=1
Note It is not permitted to redistribute the debug versions of the MFC or CRT libraries.
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Build date: 5/3/2011