acedb solaris problems

[Bob Barstead, Oklahoma Medical Research Foundation, 825 N.E. 13th Street, Oklahoma City, OK 73104 barsteadr at omrf.uokhsc.edu]

I'm having trouble running the new version 2 of acedb.  
My maching is a Sun LX running Solaris 2.2.  I believe
I've installed all the relevant patches (but I'm open to
suggestion).  I've got LD_LIBRARY_PATH set to 

/usr/openwin/lib:/usr/ucb/lib.

I've recovered bin.solaris.2_0.tar.Z from 
ncbi.nlm.nih.gov/repository/acedb/c.elegans.  The install
script worked as advertised.  When I try to run it, however,
I get the error

ld.so.1: xace: can't find file libXt.so.5
Killed

The acedb documentation suggests that all of relevant libraries
should be present.  Nevertheless, I can't seem to find libXt.so.5.
I have found libXt.so.4, and in fact all libXt.so.. files seem to 
be symbolically linked to libXt.so.4.

Any suggestions?  Have I missed a patch?  Is libXt.so.5 perhaps 
not part of the standard Solaris 2.2 release?  Is it hidden somewhere?
Is it, god forbid, part of X11R5 and I'm going to have to build the 
X11 libraries on my system?

Thanks,
Bob Barstead
Oklahoma Medical Research Foundation
barsteadr at omrf.uokhsc.edu