The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2019.07.21.12.15.13 rjs src/distrib/sets/lists/xcomp/mi,v 1.210 2019.07.21.12.15.14 rjs src/external/mit/xorg/lib/freetype/freetype/Makefile,v 1.24 2019.07.21.12.23.18 martin src/usr.sbin/sysinst/util.c,v 1.28 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2019.07.html#2019.07.21.12.23.18