/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/ is in fflas-ffpack-common 2.2.2-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/csr_pspmm.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/csr_pspmv.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/csr_spmm.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/csr_spmv.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr/csr_utils.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr_hyb/csr_hyb_pspmm.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr_hyb/csr_hyb_pspmv.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr_hyb/csr_hyb_spmm.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr_hyb/csr_hyb_spmv.inl
/usr/include/fflas-ffpack/fflas/fflas_sparse/csr_hyb/csr_hyb_utils.inl