The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2016.12.04.11.31.55 skrll src/share/man/man4/axe.4,v 1.9 2016.12.04.11.40.01 maya src/doc/CHANGES,v 1.2215 2016.12.04.11.47.29 skrll src/sys/dev/usb/if_axe.c,v 1.78 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2016.12.html#2016.12.04.11.47.29