FreeBSD Porter's Handbook
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# 12.2 `WRKDIR`

Do not write anything to files outside `WRKDIR`. `WRKDIR` is the only place that is guaranteed to be writable during the port build (see installing ports from a CDROM for an example of building ports from a read-only tree). If you need to modify one of the `pkg-`*`` files, do so by redefining a variable, not by writing over it.

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