The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.03.24.01.45.22 kamil src/sys/dev/scsipi/st.c,v 1.233 2018.03.24.01.45.23 kre src/external/public-domain/tz/dist/ziguard.awk,v 1.1 2018.03.24.01.47.49 kre src/external/public-domain/tz/dist/TZDATA_VERSION,v 1.11 2018.03.24.01.52.26 kre src/doc/3RDPARTY,v 1.1506 2018.03.24.01.52.26 kre src/doc/CHANGES,v 1.2367 2018.03.24.01.54.48 kre src/external/public-domain/tz/tzdata2netbsd,v 1.12 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.03.html#2018.03.24.01.54.48