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/usr/include/ITK-4.5/blas/zdotu.h is in libinsighttoolkit4-dev 4.5.0-3.

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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
  );