--- /dev/null
+https://bugs.gentoo.org/563352
+https://sourceforge.net/p/autogen/bugs/172/
+
+this is fixed upstream in commit f303a1d5d8d8e002974eb64818f74041325f2433
+
+--- a/pkg/libopts/mklibsrc.sh
++++ b/pkg/libopts/mklibsrc.sh
+@@ -18,8 +18,7 @@
+ ## You should have received a copy of the GNU General Public License along
+ ## with this program. If not, see <http://www.gnu.org/licenses/>.
+
+-set -ex
+-exec 2> /tmp/mklibsrc-log.tx
++set -e
+
+ top_builddir=`cd $top_builddir ; pwd`
+ top_srcdir=`cd $top_srcdir ; pwd`