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/usr/include/ITK-4.12/lapack/double/dsptrs.h is in libinsighttoolkit4-dev 4.12.2-dfsg1-1ubuntu1.

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extern int v3p_netlib_dsptrs_(
  char *uplo,
  v3p_netlib_integer *n,
  v3p_netlib_integer *nrhs,
        v3p_netlib_doublereal *ap,
  v3p_netlib_integer *ipiv,
  v3p_netlib_doublereal *b,
  v3p_netlib_integer *ldb,
  v3p_netlib_integer *info,
  v3p_netlib_ftnlen uplo_len
);