diff --git a/LICENSE b/LICENSE
index f4da52955b..ed95d35512 100644
--- a/LICENSE
+++ b/LICENSE
@@ -178,10 +178,14 @@ License: MPL-1.1
 
 Files: src/mod/endpoints/mod_gsmopen/gsmlib/gsmlib-1.10-patched-13ubuntu/*
  src/mod/languages/mod_lua/lua-mode.el
- libs/iksemel/ltmain.sh
 Copyright: 1995-2007 Free Software Foundation, Inc.
 License: GPL-2+
 
+Files:
+ libs/iksemel/ltmain.sh
+Copyright: 1995-2005 Free Software Foundation, Inc.
+License: GPL-2+ with Build System exception
+
 Files: src/mod/endpoints/mod_gsmopen/libctb-0.16/*
 Copyright: 2001-2010 Joachim Buermann
 License: wxWindows
@@ -808,6 +812,28 @@ Comment:
  On Debian systems, the full text of the GNU General Public License
  version 2 can be found in the file '/usr/share/common-licenses/GPL-2'.
 
+License: GPL-2+ with Build System exception
+ 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 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.  If not, see <https://www.gnu.org/licenses/>.
+ .
+ As a special exception to the GNU General Public License, if you
+ distribute this file as part of a program that contains a
+ configuration script generated by Autoconf, you may include it under
+ the same distribution terms that you use for the rest of that program.
+Comment:
+ On Debian systems, the full text of the GNU General Public License
+ version 2 can be found in the file '/usr/share/common-licenses/GPL-2'.
+
 License: BSD-4-clause
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
diff --git a/debian/copyright b/debian/copyright
index d42190b739..8de170bc00 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -178,10 +178,14 @@ License: MPL-1.1
 
 Files: src/mod/endpoints/mod_gsmopen/gsmlib/gsmlib-1.10-patched-13ubuntu/*
  src/mod/languages/mod_lua/lua-mode.el
- libs/iksemel/ltmain.sh
 Copyright: 1995-2007 Free Software Foundation, Inc.
 License: GPL-2+
 
+Files:
+ libs/iksemel/ltmain.sh
+Copyright: 1995-2005 Free Software Foundation, Inc.
+License: GPL-2+ with Build System exception
+
 Files: src/mod/endpoints/mod_gsmopen/libctb-0.16/*
 Copyright: 2001-2010 Joachim Buermann
 License: wxWindows
@@ -805,6 +809,28 @@ License: GPL-2+
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+License: GPL-2+ with Build System exception
+ 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 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.  If not, see <https://www.gnu.org/licenses/>.
+ .
+ As a special exception to the GNU General Public License, if you
+ distribute this file as part of a program that contains a
+ configuration script generated by Autoconf, you may include it under
+ the same distribution terms that you use for the rest of that program.
+Comment:
+ On Debian systems, the full text of the GNU General Public License
+ version 2 can be found in the file '/usr/share/common-licenses/GPL-2'.
+
 License: BSD-4-clause
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions