=> "/opt/pkg/bin/bmake" ["-C", "/data/jenkins/workspace/pkgsrc-upstream-trunk/games/gnuchess-book", "all", "BATCH=1", "DEPENDS_TARGET=/nonexistent"]
===> Building for gnuchess-book-1.02nb1
cd /tmp/work/games/gnuchess-book/work && /opt/pkg/bin/gnuchess -a book_1.02.pgn </dev/null
GNU Chess
White (1) : inserting games ...