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-rw-r--r--m4/ax_pthread.m42
-rw-r--r--m4/getopt.m42
-rw-r--r--m4/posix-shell.m42
-rw-r--r--m4/visibility.m42
4 files changed, 8 insertions, 0 deletions
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
index 9f35d139..3f26da62 100644
--- a/m4/ax_pthread.m4
+++ b/m4/ax_pthread.m4
@@ -1,3 +1,5 @@
+dnl SPDX-License-Identifier: GPL-3.0-or-later WITH Autoconf-exception-macro
+
# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_pthread.html
# ===========================================================================
diff --git a/m4/getopt.m4 b/m4/getopt.m4
index 5271f557..af8bfd4c 100644
--- a/m4/getopt.m4
+++ b/m4/getopt.m4
@@ -1,3 +1,5 @@
+dnl SPDX-License-Identifier: FSFULLR
+
# getopt.m4 serial 49 (modified version)
dnl Copyright (C) 2002-2006, 2008-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
diff --git a/m4/posix-shell.m4 b/m4/posix-shell.m4
index 4c56193c..95a19a96 100644
--- a/m4/posix-shell.m4
+++ b/m4/posix-shell.m4
@@ -1,3 +1,5 @@
+dnl SPDX-License-Identifier: FSFULLR
+
# Find a POSIX-conforming shell.
# Copyright (C) 2007-2008 Free Software Foundation, Inc.
diff --git a/m4/visibility.m4 b/m4/visibility.m4
index f0468e89..52c7ef10 100644
--- a/m4/visibility.m4
+++ b/m4/visibility.m4
@@ -1,3 +1,5 @@
+dnl SPDX-License-Identifier: FSFULLR
+
# visibility.m4 serial 8
dnl Copyright (C) 2005, 2008, 2010-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation