/usr/ is in libsquirrel-dev 3.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/squirrel3/
/usr/include/squirrel3/sqconfig.h
/usr/include/squirrel3/sqstdaux.h
/usr/include/squirrel3/sqstdblob.h
/usr/include/squirrel3/sqstdio.h
/usr/include/squirrel3/sqstdmath.h
/usr/include/squirrel3/sqstdstring.h
/usr/include/squirrel3/sqstdsystem.h
/usr/include/squirrel3/squirrel.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/squirrel3.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libsquirrel-dev/
/usr/share/doc/libsquirrel-dev/copyright
/usr/share/doc/libsquirrel-dev/stdlib.pdf
/usr/share/doc-base/
/usr/share/doc-base/libsquirrel-dev
/usr/lib/x86_64-linux-gnu/libsqstdlib3.so
/usr/lib/x86_64-linux-gnu/libsquirrel3.so
/usr/share/doc/libsquirrel-dev/README
/usr/share/doc/libsquirrel-dev/changelog.Debian.gz