/usr/share/man/man3/gl_pending_io.3.gz is in libtecla-dev 1.6.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/gl_io_mode.3.gz
/usr/share/man/man3/gl_io_mode.3.gz