/usr/include/ITK-4.5/lapack/double/dlag2.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_dlag2_(
v3p_netlib_doublereal *a,
v3p_netlib_integer *lda,
v3p_netlib_doublereal *b,
v3p_netlib_integer *ldb,
v3p_netlib_doublereal *safmin,
v3p_netlib_doublereal *scale1,
v3p_netlib_doublereal *scale2,
v3p_netlib_doublereal *wr1,
v3p_netlib_doublereal *wr2,
v3p_netlib_doublereal *wi
);
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