[gentoo-dev] PSA: python-r1.eclass, python-single-r1.eclass, and REQUIRED_USE

[Jonathan Callen <abcd@gentoo.org>]

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A quick reminder for anyone using python-r1.eclass or
python-single-r1.eclass:

These eclasses provide a ${PYTHON_REQUIRED_USE} variable that should
be included in REQUIRED_USE under the same USE conditionals (if any)
that ${PYTHON_DEPS} is included in DEPEND/RDEPEND.

For example, if your ebuild has:

RDEPEND="
    python? ( ${PYTHON_DEPS}
"

then you should also have:

REQUIRED_USE="
    python? ( ${PYTHON_REQUIRED_USE} )
"

And if your ebuild just has:

RDEPEND="${PYTHON_DEPS}"

then you should also have:

REQUIRED_USE="${PYTHON_REQUIRED_USE}"

Failure to include these in REQUIRED_USE may cause the eclass to die
very late in the build process.

Thank you,

Jonathan Callen
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