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-rw-r--r--chapter06/autoconf.xml6
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diff --git a/chapter06/autoconf.xml b/chapter06/autoconf.xml
index bf3d9ac9a..f7af4d173 100644
--- a/chapter06/autoconf.xml
+++ b/chapter06/autoconf.xml
@@ -58,6 +58,12 @@
Autoconf can be re-tested after Automake has been installed. In addition,
two tests fail due to changes in libtool-2.4.3 and later.</para>
+ <note><para>The test time for autoconf can be reduced significantly on a
+ system with multiple cores. To do this, append
+ <command>TESTSUITEFLAGS=-j&lt;N&gt;</command> to the line above. For
+ instance, using -j4 can reduce the test time by over 60
+ percent.</para></note>
+
<para>Install the package:</para>
<screen><userinput remap="install">make install</userinput></screen>