/usr/share/man/man3/ipx_addr.3.gz is in libipx-dev 10.1~svn273304-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /build/freebsd-libs-mMjDCt/freebsd-libs-10.1~svn273304/debian/tmp/usr/share/man/man3/ipx.3.gz