12 files changed, 6 insertions, 85 deletions
diff --git a/m4/ax_c___atomic.m4 b/build/m4/ax_c___atomic.m4
index dd5ee3d1c..dd5ee3d1c 100644
--- a/m4/ax_c___atomic.m4
+++ b/build/m4/ax_c___atomic.m4
diff --git a/m4/ax_c__generic.m4 b/build/m4/ax_c__generic.m4
index 0c4dd52c6..0c4dd52c6 100644
--- a/m4/ax_c__generic.m4
+++ b/build/m4/ax_c__generic.m4
diff --git a/m4/ax_c_lto.m4 b/build/m4/ax_c_lto.m4
index 7e6bc0119..7e6bc0119 100644
--- a/m4/ax_c_lto.m4
+++ b/build/m4/ax_c_lto.m4
diff --git a/m4/ax_c_mallinfo.m4 b/build/m4/ax_c_mallinfo.m4
index af8d0481e..af8d0481e 100644
--- a/m4/ax_c_mallinfo.m4
+++ b/build/m4/ax_c_mallinfo.m4
diff --git a/m4/ax_c_mallopt.m4 b/build/m4/ax_c_mallopt.m4
index 31c4fdc36..31c4fdc36 100644
--- a/m4/ax_c_mallopt.m4
+++ b/build/m4/ax_c_mallopt.m4
diff --git a/m4/ax_c_statement_expressions.m4 b/build/m4/ax_c_statement_expressions.m4
index fb259e727..fb259e727 100644
--- a/m4/ax_c_statement_expressions.m4
+++ b/build/m4/ax_c_statement_expressions.m4
diff --git a/m4/ax_check_compile_flag.m4 b/build/m4/ax_check_compile_flag.m4
index 51df0c09a..c515602f0 100644
--- a/m4/ax_check_compile_flag.m4
+++ b/build/m4/ax_check_compile_flag.m4
@@ -29,31 +29,7 @@
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
-#   This program 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 3 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. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
+#   SPDX-License-Identifier: GPL-3.0
 
 #serial 3
 
diff --git a/m4/ax_check_enable_debug.m4 b/build/m4/ax_check_enable_debug.m4
index f99d75feb..db5bab2f4 100644
--- a/m4/ax_check_enable_debug.m4
+++ b/build/m4/ax_check_enable_debug.m4
@@ -38,9 +38,7 @@
 #   Copyright (c) 2011 Rhys Ulerich <rhys.ulerich@gmail.com>
 #   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
 #
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved.
+#   SPDX-License-Identifier: FSFAP
 
 #serial 5
 
diff --git a/m4/ax_gcc_func_attribute.m4 b/build/m4/ax_gcc_func_attribute.m4
index a6d9f6c5f..6f1e1b051 100644
--- a/m4/ax_gcc_func_attribute.m4
+++ b/build/m4/ax_gcc_func_attribute.m4
@@ -69,10 +69,7 @@
 #
 #   Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
 #
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved.  This file is offered as-is, without any
-#   warranty.
+#   SPDX-License-Identifier: FSFAP
 
 #serial 4
 
diff --git a/m4/ax_pthread.m4 b/build/m4/ax_pthread.m4
index d383ad5c6..ba9ac28a5 100644
--- a/m4/ax_pthread.m4
+++ b/build/m4/ax_pthread.m4
@@ -56,31 +56,7 @@
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
 #   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
 #
-#   This program 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 3 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. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
+#   SPDX-License-Identifier: GPL-3.0-or-later
 
 #serial 21
 
diff --git a/m4/jemalloc.m4 b/build/m4/jemalloc.m4
index bb5dceb81..c2008a8ea 100644
--- a/m4/jemalloc.m4
+++ b/build/m4/jemalloc.m4
@@ -1,18 +1,5 @@
 dnl -------------------------------------------------------- -*- autoconf -*-
-dnl Licensed to the Apache Software Foundation (ASF) under one or more
-dnl contributor license agreements.  See the NOTICE file distributed with
-dnl this work for additional information regarding copyright ownership.
-dnl The ASF licenses this file to You under the Apache License, Version 2.0
-dnl (the "License"); you may not use this file except in compliance with
-dnl the License.  You may obtain a copy of the License at
-dnl
-dnl     http://www.apache.org/licenses/LICENSE-2.0
-dnl
-dnl Unless required by applicable law or agreed to in writing, software
-dnl distributed under the License is distributed on an "AS IS" BASIS,
-dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-dnl See the License for the specific language governing permissions and
-dnl limitations under the License.
+dnl SPDX-License-Identifier: Apache-2.0
 
 dnl
 dnl jemalloc.m4: Trafficserver's jemalloc autoconf macros
diff --git a/m4/tcmalloc.m4 b/build/m4/tcmalloc.m4
index e84697dc7..765d2accc 100644
--- a/m4/tcmalloc.m4
+++ b/build/m4/tcmalloc.m4
@@ -1,18 +1,5 @@
 dnl -------------------------------------------------------- -*- autoconf -*-
-dnl Licensed to the Apache Software Foundation (ASF) under one or more
-dnl contributor license agreements.  See the NOTICE file distributed with
-dnl this work for additional information regarding copyright ownership.
-dnl The ASF licenses this file to You under the Apache License, Version 2.0
-dnl (the "License"); you may not use this file except in compliance with
-dnl the License.  You may obtain a copy of the License at
-dnl
-dnl     http://www.apache.org/licenses/LICENSE-2.0
-dnl
-dnl Unless required by applicable law or agreed to in writing, software
-dnl distributed under the License is distributed on an "AS IS" BASIS,
-dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-dnl See the License for the specific language governing permissions and
-dnl limitations under the License.
+dnl SPDX-License-Identifier: Apache-2.0
 
 dnl
 dnl tcmalloc.m4: Trafficserver's tcmalloc autoconf macros