documentation/poky-ref-manual/ref-variables.xml: update PREFERRED_PROVIDER
I added sterner wording on usage and provided an example. (From yocto-docs rev: 32e07fafadb602b93c9f7b8a78e5baf4c7e1ab5e) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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<glossentry id='var-PREFERRED_PROVIDER'><glossterm>PREFERRED_PROVIDER</glossterm>
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<glossdef>
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<para>If multiple recipes provide an item, this variable
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<para>
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If multiple recipes provide an item, this variable
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determines which recipe should be given preference.
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The variable should be set to the <filename>$PN</filename> of the recipe
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to which you want to give precedence.</para>
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The variable must always be suffixed with the name of the
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provided item, and should be set to the
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<filename>$PN</filename> of the recipe
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to which you want to give precedence.
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Here is an example:
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<literallayout class='monospaced'>
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PREFERRED_PROVIDER_virtual/xserver = "xserver-xf86"
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</literallayout>
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</para>
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</glossdef>
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</glossentry>
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