On the off-chance they're relevant and Jmol is a red herring, I'm re-sending
my misplaced comments [1] about relevant parts of /usr/bin/sage here:

> By the way, looking at the header of that file I see
>  # workaround #892622; unfortunately we can't simply run setarch -R when 
> running Singular
>  # because src/sage/libs/singular/singular.pyx loads libsingular.so into the 
> current process
>  if [ "$(arch)" = "mips64" -a -z "$SAGE_DEB_MIPS64_WORKAROUND" ]; then
>     SAGE_DEB_MIPS64_WORKAROUND=1 exec setarch mips64 -R "$0" "$@"
>  fi
> 
> I don't understand the test inside the brackets. Why do you use -a [in
> addition to the -z] when there is no mention of a file? And if you're
> checking equality, shouldn't that be a double equals sign (==)?
> 
> Furthermore, the code refers to mips64, but #892622 refers to mips64el. Is
> it possible these issues are the cause of Sage failing to build from source
> there (#920147)?
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948731#12

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