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> .Dd March 5, 2014
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> .It Va CHROOT_MAKEENV
> Additional
> .Xr make 1
> arguments to pass through, which directly affect the
> tuning of the build chroot.
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> .It Va CHROOTBUILD_SKIP
> If defined, the
> .Li buildworld ,
> .Li installworld ,
> and
> .Li distribution
> stages of the
> .Xr chroot 8
> build environment setup are skipped.
> This is intended solely for cases where the
> .Xr chroot 8
> userland are provided by alternate means.
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> .Sh EMBEDDED BUILDS
> The following
> .Fa release.conf
> variables are relevant only to release builds for embedded systems:
> .Bl -tag -width Ev
> .It Va EMBEDDEDBUILD
> Set to a non-null value to enable functionality for embedded device
> release builds.
> .Pq This option is considered highly experimental.
> .Pp
> When set,
> .Va WITH_DVD
> is unset, and
> .Va NODOC
> is defined.
> Additionally,
> .Va XDEV
> and
> .Va XDEV_ARCH
> must also be defined.
> When the build environment is created,
> .Fa release.sh
> runs a separate build script located in an architecture-specific
> directory in
> .Pa src/release/${XDEV}/ .
> .It Va EMBEDDEDPORTS
> Set to the list of any ports that are required for the target device
> in the format of
> .Fa category/port .
> The
> .Fa devel/subversion
> port is built by default.
> .It Va CROCHETSRC
> Set to the source URL for the Crochet build tool.
> .It Va CROCHETBRANCH
> Set to the subversion branch from
> .Va ${CROCHETSRC}
> to use.
> Defaults to
> .Pa trunk .
> .It Va UBOOTSRC
> Set to the source URL of u-boot, if required.
> .It Va UBOOTBRANCH
> Set to the subversion branch from
> .Va ${UBOOTSRC}
> to use.
> Defaults to
> .Pa trunk .
> .It Va UBOOTDIR
> Set to the target directory within
> .Va ${CHROOTDIR}
> to check out
> .Va ${UBOOTSRC}/${UBOOTBRANCH} .
> .El