/usr/include/ITK-4.9/blas/zdotu.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 | extern v3p_netlib_Z_f v3p_netlib_zdotu_(
v3p_netlib_doublecomplex * ret_val,
v3p_netlib_integer *n,
v3p_netlib_doublecomplex *zx,
v3p_netlib_integer *incx,
v3p_netlib_doublecomplex *zy,
v3p_netlib_integer *incy
);
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