Is anyone else using lbxproxy (Low Bandwidth X)?

A couple of years ago it ran with no problem, but now when I use the
version in the latest xsrc from NetBSD CVS (well, less than 2 weeks old
anyway), it gives me this complaint:

 open_unix_socket() mkdir error: File exists

 Fatal proxy error:
 Cannot establish unix listening socket

if the directory /tmp/.X11-unix already exists when it is run. If I
manually remove that directory before starting lbxproxy, everything
works fine, but of course that isn't an option when there may be several
users of the directory at once.

The file generating the error is
/usr/xsrc/xc/programs/lbxproxy/os/connection.c.

Does anyone know if this code has changed in the past couple years? Or
has something changed in NetBSD libs/kernel that would cause this
problem. Note that other Xservers (eg, Xvnc) don't complain when
/tmp/.X11-unix already exists.