Unbound 1.8.0 fails to build using poudriere: ./configure: 16926: Syntax error: word unexpected (expecting ")") ===> Script "configure" failed unexpectedly. Detailed log: https://poudriere.koumakan.jp/data/11amd64-default/2018-09-21_05h41m20s/logs/errors/unbound-1.8.0.log
Seems a duplicate of https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231488
Agreed, seems to be the same issue. Please update and try again. Closing for now, let us know if it's not fixed for you.
*** This bug has been marked as a duplicate of bug 231488 ***