Answer: Application crashes when text is cut and pasted into an XmText widget
may occur with statically linked executables linked with X11R5 libraries under
SunOS. For example, a Netscape README file says:

The SunOS 4.1 [Netscape 0.94] distribution also includes a directory called
"nls".  This directory is a standard part of the MIT X11R5 distribution, but
is not included with OpenWindows 3.0 or earlier.  We have linked Netscape
against the MIT R5 libraries because they are less buggy in general; however,
they have one rather serious bug, which is that if this "nls" directory does
not exist, the program will dump core any time you try to paste into a text
field!

So, if you don't have the "nls" directory on your system, you will need to
install it first.  The usual place is /usr/lib/X11/nls, but you can put it
anywhere: just point the $XNLSPATH environment variable at it.

Some sites don't have their X libraries installed in /usr/lib/X11/.  This
doesn't matter.  You either need to put the nls directory in /usr/lib/X11/, or
every user will need to set this environment variable.

So, for example, we do:

setenv XNLSPATH /usr/local/x11r5/lib/X11/nls

since our X11R5 is not installed in the default location.