--- /dev/null
+#!/bin/sh
+
+# Test of Tcl support.
+
+tmpfiles=""
+trap 'rm -fr $tmpfiles' 1 2 3 15
+
+tmpfiles="$tmpfiles xg-test21.tcl"
+cat <<\EOF > xg-test21.tcl
+#!/usr/bin/tclsh
+
+proc isValid {target} {
+ global viScreenId
+ set address [valid $target]
+ # This comment is not extracted.
+ if {$address != 0} {
+ # First comment line.
+
+ # Second comment line.
+ viMsg $viScreenId [format [_ "%s is %s"] $target [string trim $address]]
+ } else {
+ viMsg $viScreenId [format [_ "%s not found"] $target]
+ }
+}
+EOF
+
+tmpfiles="$tmpfiles xg-test21.err xg-test21.tmp xg-test21.pot"
+: ${XGETTEXT=xgettext}
+${XGETTEXT} --add-comments --no-location -k_ -o xg-test21.tmp xg-test21.tcl 2>xg-test21.err
+test $? = 0 || { cat xg-test21.err; rm -fr $tmpfiles; exit 1; }
+grep -v 'POT-Creation-Date' < xg-test21.tmp > xg-test21.pot
+
+tmpfiles="$tmpfiles xg-test21.ok"
+cat <<\EOF > xg-test21.ok
+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#. First comment line.
+#. Second comment line.
+#, tcl-format
+msgid "%s is %s"
+msgstr ""
+
+#, tcl-format
+msgid "%s not found"
+msgstr ""
+EOF
+
+: ${DIFF=diff}
+${DIFF} xg-test21.ok xg-test21.pot
+result=$?
+
+rm -fr $tmpfiles
+
+exit $result