<section id='package-ebuild-eapi-5-hdepend'>
<title>EAPI 5-hdepend</title>
<section id='package-ebuild-eapi-5-hdepend-metadata'>
<title>Metadata</title>
<section id='package-ebuild-eapi-5-hdepend-metadata-dependencies'>
<title>Dependencies</title>
<section id='package-ebuild-eapi-5-hdepend-metadata-dependencies-hdepend'>
<title>HDEPEND</title>
<para>
The HDEPEND variable is used to represent build-time host dependencies. For
build-time target dependencies, use DEPEND (if the host is the target then both
HDEPEND and DEPEND will be installed on it). For EAPIs that support HDEPEND,
the emerge --root-deps option will have no effect, since it is not needed
when build-time dependencies are correctly specified with HDEPEND and DEPEND.
If ebuilds using EAPIs which <emphasis>do not</emphasis> support HDEPEND are
built in the same emerge run as those using EAPIs which <emphasis>do</emphasis>
support HDEPEND, the emerge --root-deps option will only apply to the former.
</para>
</section>
<section id='package-ebuild-eapi-5-hdepend-metadata-dependencies-targetroot'>
<title>Special "targetroot" USE flag</title>
<para>
The special "targetroot" USE flag will be automatically enabled for packages
that are built for installation into a target ROOT, and will otherwise be
automatically disabled. This flag may be used to control conditional
dependencies, and ebuilds that use this flag need to add it to IUSE unless it
happens to be included in the profile's IUSE_IMPLICIT variable.
</para>
</section>
</section>
</section>
</section>