The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.12.11.06.30.11 christos src/sys/dev/files.audio,v 1.7 2016.12.11.06.37.49 christos src/share/mk/bsd.own.mk,v 1.999 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.12.html#2016.12.11.06.37.49