BUILD_MAKE_PROGRAM
Use the BUILD_MAKE_PROGRAM environment variable to specify the make program to execute.
By default, the NMAKE utility (Nmake.exe) is used. However, the Build utility can use any make program. To select a program other than NMAKE, set BUILD_MAKE_PROGRAM equal to the full path and file name of the desired program.
Caution Microsoft does not support the use of an alternate make program. It is highly recommended that you not change the value of this variable.
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Build date: 5/3/2011