Build of NetBSD-6.1RC2/amd64 fails

[Sverre Froyen <sverre%viewmark.com@localhost>]

Hi,

I've been using a NetBSD-current/amd64 system to build netbsd-6 i386 and amd64 
kernels and sets ever since the netbsd-6 branch was created. This used to work 
fine, but with the latest netbsd-6 sources an amd64 distribution build fails 
with

dependall ===> usr.sbin/npf/npfctl
#      link  npfctl/npfctl
/usr/src/tooldir/bin/x86_64--netbsd-gcc    
--sysroot=/usr/src/obj.amd64/destdir.amd64     -o npfctl  npfctl.o npf_var.o 
npf_data.o npf_ncgen.o npf_build.o npf_extmod.o npf_disassemble.o npf_scan.o 
npf_parse.o -lnpf -lprop -lcrypto -lutil -ly       
-Wl,-dynamic-linker=/libexec/ld.elf_so -Wl,-rpath,/lib  -L=/lib
/lib/libcrypt.so.1: undefined reference to `__explicit_bzero'
collect2: ld returned 1 exit status

It looks like the build system is using current version /lib/libcrypt.so rather 
than the netbsd-6 version. Is this a known issue or have I somehow messed up my 
build system?

i386 builds fine, as do tools and kernel. My build command is

./build.sh -T tooldir -O obj.amd64 distribution

Regards,
Sverre