The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.01.11.14.52.02 hannken src/sys/kern/vfs_subr.c,v 1.459 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.01.html#2017.01.11.14.52.02