/usr/include/fflas-ffpack/fflas-ffpack-optimise.h is in fflas-ffpack 2.2.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #ifndef __FFLASFFPACK_optimise_H
#define __FFLASFFPACK_optimise_H
#endif // optimise.h
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