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D20885.id59575.diff
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Index: en_US.ISO8859-1/books/porters-handbook/porting-dads/chapter.xml
===================================================================
--- en_US.ISO8859-1/books/porters-handbook/porting-dads/chapter.xml
+++ en_US.ISO8859-1/books/porters-handbook/porting-dads/chapter.xml
@@ -569,6 +638,25 @@
</listitem>
</itemizedlist>
</sect2>
+
+ <sect2 xml:id="dads-arch-cluster">
+ <title>Cluster-Specific Considerations</title>
+
+ <itemizedlist>
+ <listitem>
+ <para>Some ports attempt to tune themselves to the
+ exact machine they are being built on by specifying
+ <literal>-march=native</literal> to the compiler.
+ This should be avoided: either list it under an
+ off-by-default <varname>OPTION</varname>, or delete
+ it entirely.</para>
+
+ <para> Otherwise, the default package produced by the
+ build cluster might not run on every single machine
+ of that <varname>ARCH</varname>.</para>
+ </listitem>
+ </itemizedlist>
+ </sect2>
</sect1>
<sect1 xml:id="dads-deprecated">
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