The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.05.28.13.55.07 kre src/tests/net/can/h_canutils.c,v 1.3 2017.05.28.14.14.22 kre src/bin/sh/Makefile,v 1.109 2017.05.28.14.14.22 kre src/bin/sh/mkoptions.sh,v 1.2 2017.05.28.14.14.22 kre src/bin/sh/option.list,v 1.2 2017.05.28.14.16.05 mlelstv src/sys/netipsec/key.c,v 1.146 2017.05.28.14.49.00 christos src/tests/net/can/t_can.c,v 1.4 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.05.html#2017.05.28.14.49.00