/usr/share/doc/libfftw3-dev/NEWS.gz is in libfftw3-dev 3.3.3-7ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libfftw3-dev/../libfftw3-double3/NEWS.gz
/usr/share/doc/libfftw3-dev/../libfftw3-double3/NEWS.gz