It fails to build with newer versions of gnuchess because gnuchess no longer exits. I've reported this upstream:
http://lists.gnu.org/archive/html/bug-gnu-chess/2016-09/msg00000.html Vincent
- Bug#834670: gnuchess-book: FTBFS in testing (bu... Santiago Vila
- Bug#834670: marked as done (gnuchess-book:... Debian Bug Tracking System
- Bug#834670: gnuchess-book: FTBFS in testin... Vincent Legout
