/usr/lib/librfftw_mpi.so.2 is in fftw2 2.1.5-4.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/librfftw_mpi.so.2.0.7
/usr/lib/librfftw_mpi.so.2.0.7