[plt-scheme] missing shared library libSM.so.6 -- plt-203 and NetBSD

I successfully unpacked, configured and made plt.src.x.tar.gz into
/usr/local/plt, with both NetBSD 1.6..

Typing ./drscheme from /usr/local/plt/bin, however, returns "Shared
object "libSM.so.6" not found.

Under NetBSD 1.6, /usr/X11R6/lib/libSM.so.6 is a symlink to
/usr/X11R6/lib/libSM.so.6.0.

Using configure --x-libraries=/usr/X11R6/lib  has not solved the
problem.

Can anyone suggest a work-around?  mzscheme itself - built at the
same time - works fine.


Thanks,


Doug Troeger