/usr/share/slsh/ is in slang-xfig 0.2.0~.117-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/slsh/local-packages/
/usr/share/slsh/local-packages/gcontour.sl
/usr/share/slsh/local-packages/help/
/usr/share/slsh/local-packages/help/gcontour.hlp
/usr/share/slsh/local-packages/help/slxfig.hlp
/usr/share/slsh/local-packages/help/vector.hlp
/usr/share/slsh/local-packages/vector.sl
/usr/share/slsh/local-packages/xfig/
/usr/share/slsh/local-packages/xfig.sl
/usr/share/slsh/local-packages/xfig/clip.sl
/usr/share/slsh/local-packages/xfig/core.sl
/usr/share/slsh/local-packages/xfig/ellipse.sl
/usr/share/slsh/local-packages/xfig/latex.sl
/usr/share/slsh/local-packages/xfig/objects.sl
/usr/share/slsh/local-packages/xfig/plot.sl
/usr/share/slsh/local-packages/xfig/png.sl
/usr/share/slsh/local-packages/xfig/polyline.sl
/usr/share/slsh/local-packages/xfig/text.sl
/usr/share/slsh/local-packages/xfig/w3ccolors.txt