Compiling recent current sources (cd /usr/src && sh build.sh) I get after a couple of hours

/usr/src/tools/obj/tools.NetBSD-1.5Y-sparc64/bin/sparc64--netbsd-gcc  -static -o installboot -nostdlib -Wl,-rpath-link,/usr/lib /usr/lib/crt0.o /usr/lib/crtbegin.o installboot.o byteorder.o loadfile.o loadfile_aout.o loadfile_elf32.o  -L/usr/lib -lgcc -lc -lgcc /usr/lib/crtend.o
loadfile.o: In function `loadfile':
/usr/src/sys/arch/sparc/stand/installboot/../../../../lib/libsa/loadfile.c:149: undefined reference to `loadfile_elf64'
collect2: ld returned 1 exit status
*** Error code 1

Stop.
nbmake: stopped in /usr/src/sys/arch/sparc/stand/installboot
*** Error code 1

Maybe I'm making a fool out of myself, but could somebody please point me into the
right direction? I don't fully understand the implications of this USE_NEW_TOOLCHAIN thing,
either. Using it will just make things break earlier in even more obscure ways.
I know that -current will be harmful to mental health, but I thought that it should
at least produce *something* (even if it's only broken binaries).
-- 
Volker Stolz * stolz@i2.informatik.rwth-aachen.de * PGP + S/MIME