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/usr/include/ITK-4.9/lapack/complex16/zlacn2.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.

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extern int v3p_netlib_zlacn2_(
  v3p_netlib_integer *n,
  v3p_netlib_doublecomplex *v,
  v3p_netlib_doublecomplex *x,
  v3p_netlib_doublereal *est,
  v3p_netlib_integer *kase,
  v3p_netlib_integer *isave
  );