ctfmerge core dump

After updating from -CURRENT as of April 5 to one built today, I now get
a core dump running ctfmerge on libc:

ctfmerge -L VERSION -g -o libc.so.7 syscall.So fork.So......
Bus error (core dumped)
*** [libc.so.7] Error code 138

Anyone else seeing this or have any idea how to avoid it? Let me know if
you need more details on my config.

Thanks,
Steve