BUILD_DEFAULT_TARGETS
Use the BUILD_DEFAULT_TARGETS environment variable to specify the default target platform (the platform for which you are building).
For example, assuming that the appropriate cross-compiler existed, you could set BUILD_DEFAULT_TARGETS to -386 on an Itanium-based computer and build x86 binaries.
Usually, you set this variable to the platform that the Build utility is running on. For example:
c:\> build -386
means the same as:
c:\> set BUILD_DEFAULT_TARGETS=-386
c:\> build
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Build date: 5/3/2011