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

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extern int v3p_netlib_zscal_(
  v3p_netlib_integer *n,
  v3p_netlib_doublecomplex *za,
  v3p_netlib_doublecomplex *zx,
  v3p_netlib_integer *incx
  );