The default is 2x the number of active CPUS. $ make MAKEJOBS=-j8 # this will use 8 processes during the build.$ make ARCH_CONFIGS="X86_64" exporthdrs all The xnu make system can build kernel based on KERNEL_CONFIGS & ARCH_CONFIGS variables as arguments.
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How to build XNU Building DEVELOPMENT kernel tools - A set of utilities for testing, debugging and profiling kernel.security - Mandatory Access Check policy interfaces and related implementation.