FreeBSD Porter's Handbook
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# 6.24 Ports that rely on kernel sources

Some ports (such as kernel loadable modules) need the kernel source files so that the port can compile. Here is the correct way to determine if the user has them installed:

    SRC_BASE?=      /usr/src

    .if !exists(${SRC_BASE}/sys/Makefile)
    IGNORE=         requires kernel sources to be installed
    .endif

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