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/usr/include/ITK-4.5/eispack/reduc.h is in libinsighttoolkit4-dev 4.5.0-3.

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extern int v3p_netlib_reduc_(
  v3p_netlib_integer *nm,
  v3p_netlib_integer *n,
  v3p_netlib_doublereal *a,
  v3p_netlib_doublereal *b,
  v3p_netlib_doublereal *dl,
  v3p_netlib_integer *ierr
  );