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diff --git a/libctf/mkerrors.sed b/libctf/mkerrors.sed
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+#
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING. If not see
+# <http://www.gnu.org/licenses/>.
+#
+
+# Only process lines in the error-define block
+/= ECTF_BASE/,/ECTF_NERR/ {
+ # Do not process non-errors (braces, ECTF_NERR, etc).
+ /^ *ECTF_/!n;
+ # Strip out the base initializer.
+ s, = ECTF_BASE,,;
+ # Transform errors into _STR(...).
+ s@^ *\(ECTF_[^[:blank:],]*\),\{0,1\}[[:blank:]]*/\* \(.*\). \*/$@_CTF_STR (\1, "\2")@;
+ p;
+ }