/usr/include/ITK-4.9/lapack/double/dgerq2.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
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 | extern int v3p_netlib_dgerq2_(
v3p_netlib_integer *m,
v3p_netlib_integer *n,
v3p_netlib_doublereal *a,
v3p_netlib_integer *lda,
v3p_netlib_doublereal *tau,
v3p_netlib_doublereal *work,
v3p_netlib_integer *info
);
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