/usr/include/ITK-4.5/lapack/double/dtgsy2.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 13 14 15 16 17 18 19 20 21 22 23 24 25 | extern int v3p_netlib_dtgsy2_(
char *trans,
v3p_netlib_integer *ijob,
v3p_netlib_integer *m,
v3p_netlib_integer *n,
v3p_netlib_doublereal *a,
v3p_netlib_integer *lda,
v3p_netlib_doublereal *b,
v3p_netlib_integer *ldb,
v3p_netlib_doublereal *c__,
v3p_netlib_integer *ldc,
v3p_netlib_doublereal *d__,
v3p_netlib_integer *ldd,
v3p_netlib_doublereal *e,
v3p_netlib_integer *lde,
v3p_netlib_doublereal *f,
v3p_netlib_integer *ldf,
v3p_netlib_doublereal *scale,
v3p_netlib_doublereal *rdsum,
v3p_netlib_doublereal *rdscal,
v3p_netlib_integer *iwork,
v3p_netlib_integer *pq,
v3p_netlib_integer *info,
v3p_netlib_ftnlen trans_len
);
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