Comment # 7 on bug 953149 from Dominique Leuenberger

For arguments sake:

The test works on Factory (see build log, still against 9.16)
https://build.opensuse.org/build/X11:common:Factory/openSUSE_Factory/x86_64/libspectre/_log

[   66s] + IFS=.
[   66s] + read GS_MAJ GS_MIN
[   66s] ++ rpm -q --qf '%{version}' ghostscript-devel
[   66s] + IFS='     
[   66s] '
[   66s] + '[' 9 -gt 9 -o 9 -eq 9 -a 16 -gt 17 ']'
[   66s] + exit 0

hence, if 13.2 support which does not like the read GS_MAJ GS_MIN is needed,
resorting to zypper vcmp (or anything else that manages to properly compare
versions) is needed... (we can't guarantee that GS won't ever do a strange
thing like a hot fix 9.20a; so pure mathematical conversion will always be
flawed)