The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.10.12.06.49.40 nat src/external/realtek/urtwn/Makefile,v 1.3 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.10.html#2016.10.12.06.49.40