/usr/lib/slang/v2/modules/gcontour-module.so is in slang-xfig 0.2.0~.35-1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/slang/v2/modules/gcontour-module.so.0.1.0
/usr/lib/slang/v2/modules/gcontour-module.so.0.1.0