/usr/include/ITK-4.5/lapack/complex16/ztrexc.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 9 10 11 12 | extern int v3p_netlib_ztrexc_(
char *compq,
v3p_netlib_integer *n,
v3p_netlib_doublecomplex *t,
v3p_netlib_integer *ldt,
v3p_netlib_doublecomplex *q,
v3p_netlib_integer *ldq,
v3p_netlib_integer *ifst,
v3p_netlib_integer *ilst,
v3p_netlib_integer *info,
v3p_netlib_ftnlen compq_len
);
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