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Index: head/en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
+++ head/en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml
@@ -1167,16 +1167,51 @@
<application>Perl</application>, <application>PHP</application>,
<application>Python</application>,
<application>Ruby</application>, <application>Tcl</application>,
- and <application>Tk</application> are supported by default. To
- support another interpreter, set
- <varname>SHEBANG_LANG</varname>,
- <varname><replaceable>interp</replaceable>_OLD_CMD</varname> and
- <varname><replaceable>interp</replaceable>_CMD</varname>. For
- example:</para>
+ and <application>Tk</application> are supported by
+ default.</para>
+
+ <para>There are three configuration variables:</para>
+
+ <variablelist>
+ <varlistentry>
+ <term><varname>SHEBANG_LANG</varname></term>
+
+ <listitem>
+ <para>The list of supported interpreters.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname><replaceable>interp</replaceable>_CMD</varname></term>
+
+ <listitem>
+ <para>The path to the command interpreter on &os;. The
+ default value is
+ <literal>${LOCALBASE}/bin/<replaceable>interp</replaceable></literal>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname><replaceable>interp</replaceable>_OLD_CMD</varname></term>
+ <listitem>
+ <para>The list of wrong invocations of interpreters. These
+ are typically obsolete paths, or paths used on other
+ operating systems that are incorrect on &os;. They
+ will be replaced by the correct path in
+ <varname><replaceable>interp</replaceable>_CMD</varname>.
+ This list will always be part of
+ <varname><replaceable>interp</replaceable>_OLD_CMD</varname>:
+ <literal>"/usr/bin/env <replaceable>interp</replaceable>"
+ /bin/<replaceable>interp</replaceable>
+ /usr/bin/<replaceable>interp</replaceable></literal>.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+
+ <para>To add another interpreter, set
+ <varname>SHEBANG_LANG</varname>. For example:</para>
- <programlisting>SHEBANG_LANG= lua
-lua_OLD_CMD= /usr/bin/lua
-lua_CMD= ${LOCALBASE}/bin/lua</programlisting>
+ <programlisting>SHEBANG_LANG= lua</programlisting>
<para><literal><replaceable>interp</replaceable>_OLD_CMD</literal>
will contain multiple values. Any entry with spaces must be

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