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/usr/include/ITK-4.5/linpack/dpoco.h is in libinsighttoolkit4-dev 4.5.0-3.

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/*: Factors a symmetric positive definite matrix and estimates the
    condition of the matrix */
extern int v3p_netlib_dpoco_(
  v3p_netlib_doublereal *a,
  v3p_netlib_integer *lda,
  v3p_netlib_integer *n,
  v3p_netlib_doublereal *rcond,
  v3p_netlib_doublereal *z__,
  v3p_netlib_integer *info
  );