The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.10.16.06.17.51 abhinav src/usr.bin/uniq/uniq.c,v 1.20 2016.10.16.06.23.48 mrg src/external/mit/xorg/server/drivers/Makefile,v 1.91 2016.10.16.06.40.43 kre src/sys/arch/xen/include/intr.h,v 1.38 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.10.html#2016.10.16.06.40.43