It will be compiled with 3.1.2D but should run with previous versions.
Moving from X11R6 to X11R6.1 introduced a change in the libraries but
it's still the same major version number so I assume these are compatible :
$ ldd thotmain
libXt.so.6 => /usr/X11R6/lib/libXt.so.6.0
libSM.so.6 => /usr/X11R6/lib/libSM.so.6.0
libICE.so.6 => /usr/X11R6/lib/libICE.so.6.0
libXext.so.6 => /usr/X11R6/lib/libXext.so.6.1
libX11.so.6 => /usr/X11R6/lib/libX11.so.6.1
libm.so.5 => /lib/libm.so.5.0.5
libc.so.5 => /lib/libc.so.5.2.18
$
Thot in itself should be compatible with X11R5 and X11R6.
Daniel
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