/usr/include/ITK-4.5/eispack/tql2.h is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | extern int v3p_netlib_tql2_(
v3p_netlib_integer *nm,
v3p_netlib_integer *n,
v3p_netlib_doublereal *d__,
v3p_netlib_doublereal *e,
v3p_netlib_doublereal *z__,
v3p_netlib_integer *ierr
);
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