On an ultra2, with 1.6.2ish I built pkgsrc/editors/emacs.  It worked
fine - no oddness at all.

I got an ultra5, and installed 1.6.1 from CD.  I copied the emacs
binary package from the 1.6.2ish box and installed it, and got:

gdt 37 ~ > emacs
assertion "u.hdr.e_phentsize == sizeof(Elf_Phdr)
" failed: file "/usr/ANONCVS/src/libexec/ld.elf_so/map_object.c", line
126
Abort trap (core dumped)

It is at least somewhat dangerous to run 1.6.2 binaries on 1.6.1, so I
upgraded the u5 to 1.6.2 (via build.sh) and rebooted, and still got
the problem (the above is from when running 1.6.2, actually).

I built emacs from pkgsrc on the 1.6.2 u5, and that works fine on the
u5.

This seems perhaps similar to Jan's glut problem on -current:

  http://mail-index.netbsd.org/tech-pkg/2004/01/20/0015.html