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-rw-r--r--chapter06/binutils-exp.xml9
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diff --git a/chapter06/binutils-exp.xml b/chapter06/binutils-exp.xml
index fb149b60f..1f171f937 100644
--- a/chapter06/binutils-exp.xml
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@@ -1,6 +1,15 @@
<sect2>
<title>Command explanations</title>
+<para><userinput>tooldir=/usr:</userinput> Normally, the tooldir (the
+directory where the executables from binutils end up in) is set to
+$(exec_prefix)/$(target_alias) which expands into, for example,
+/usr/i686-pc-linux-gnu. Since we only build for our own system, we don't
+need this target specific directory in /usr. That setup would be used
+if the system was used to cross-compile (for example
+compiling a package on the Intel machine that generates code that can be
+executed on Apple PowerPC machines).</para>
+
<para><userinput>make tooldir=/usr install-info:</userinput> This will
install binutil's info pages.</para>