dnl Some hacks...
test "$prefix" = "NONE" && prefix="/usr"
test "$prefix" = "/usr" && exec_prefix=""

ubindir = ${prefix}/bin
usbindir = ${prefix}/sbin
...

# XXX why are login and su in /bin anyway (other than for
# historical reasons)?
#
# if the system is screwed so badly that it can't mount /usr,
# you can (hopefully) boot single user, and then you're root
# so you don't need these programs for recovery.
#
# also /lib/libshadow.so.x.xx (if any) could be moved to /usr/lib
# and installation would be much simpler (just two directories,
# $prefix/bin and $prefix/sbin, no install-data hacks...)

bin_PROGRAMS   = login
sbin_PROGRAMS  = nologin
ubin_PROGRAMS  = faillog chage chfn chsh expiry gpasswd newgrp passwd

...