I believe this issue is due to <https://bugs.debian.org/821065>. According to the buildlog it was using ant_1.9.7-1 which contained that bug. The new revision 1.9.7-2 is uploaded, hope it works.
And I believe IBM's copyright has been covered by the first section in d/copyright? ``` Files: * Copyright: 1995-2016, International Business Machines Corporation License: ICU ```
