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	Index: head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
	===================================================================
	--- head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
	+++ head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
	@@ -4487,6 +4487,22 @@
	.else
	BIN3_BUILD= no
	.endif</programlisting>
	+
	+ <tip>
	+ <para>Values containing whitespace must be enclosed in
	+ quotes:</para>
	+
	+ <programlisting>OPT_VARS= foo="bar baz"</programlisting>
	+
	+ <para>This is due to the way &man.make.1; variable expansion
	+ deals with whitespace. When <literal>OPT_VARS= foo=bar
	+ baz</literal> is expanded, the variable ends up
	+ containing two strings, <literal>foo=bar</literal> and
	+ <literal>baz</literal>. But the submitter probably
	+ intended there to be only one string, <literal>foo=bar
	+ baz</literal>. Quoting the value prevents whitespace
	+ from being used as a delimiter.</para>
	+ </tip>
	</sect3>

	<sect3 xml:id="options-dependencies">