FreeBSD Porter's Handbook
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# 8.4 `pkg-req`

If your port needs to determine if it should install or not, you can create a `pkg-req` ``requirements'' script. It will be invoked automatically at installation/de-installation time to determine whether or not installation/de-installation should proceed.

The script will be run at installation time by pkg_add(1) as `pkg-req ${PKGNAME} INSTALL`. At de-installation time it will be run by pkg_delete(1) as `pkg-req ${PKGNAME} DEINSTALL`.

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