The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.02.06.12.45.39 jakllsch src/sys/arch/arm/sunxi/sun6i_spireg.h,v 1.1 2018.02.06.12.58.17 martin src/sys/modules/pf/Makefile,v 1.6 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.02.html#2018.02.06.12.58.17