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/usr/include/ITK-4.9/lapack/complex16/ztgex2.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.

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extern int v3p_netlib_ztgex2_(
  v3p_netlib_logical *wantq,
  v3p_netlib_logical *wantz,
  v3p_netlib_integer *n,
  v3p_netlib_doublecomplex *a,
  v3p_netlib_integer *lda,
  v3p_netlib_doublecomplex *b,
  v3p_netlib_integer *ldb,
  v3p_netlib_doublecomplex *q,
  v3p_netlib_integer *ldq,
  v3p_netlib_doublecomplex *z__,
  v3p_netlib_integer *ldz,
  v3p_netlib_integer *j1,
  v3p_netlib_integer *info
  );