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-rw-r--r--chapter05/tcl.xml5
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diff --git a/chapter05/tcl.xml b/chapter05/tcl.xml
index 9a264ad68..4fcc10b61 100644
--- a/chapter05/tcl.xml
+++ b/chapter05/tcl.xml
@@ -48,6 +48,11 @@
run in this chapter (they are not mandatory), these packages are required
to run the test suites in <xref linkend="chapter-building-system"/>.</para>
+ <para>First increase the amount of space needed by some regular expressions
+ in regression tests.</para>
+
+<screen><userinput remap="pre">sed -i s/500/5000/ generic/regc_nfa.c</userinput></screen>
+
<para>Prepare Tcl for compilation:</para>
<screen><userinput remap="configure">cd unix