diff --git a/debian/copyright b/debian/copyright
index a7570a430..6db681295 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -220,3 +220,49 @@ License: Expat
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
+
+Files: m4/l_atomic.m4
+Copyright: 2015 Tim Kosse
+License: FSFAP
+ 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.
+
+Files: m4/ax_check_compile_flag.m4
+Copyright: 2008 Guido U. Draheim, 2011 Maarten Bosmans
+License: GPL-3+
+ 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/>.
+ .
+ On Debian systems, the complete text of the GNU General
+ Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".
+
+Files: m4/ax_prefix_config_h.m4
+Copyright: 2008 Guido U. Draheim, 2008 Marten Svantesson, 2008 Gerald Point
+License: GPL-3+
+ 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/>.
+ .
+ On Debian systems, the complete text of the GNU General
+ Public License version 3 can be found in "/usr/share/common-licenses/GPL-3".