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/usr/include/ITK-4.9/blas/dtrsv.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.

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extern int v3p_netlib_dtrsv_(
  char *uplo,
  char *trans,
  char *diag,
  v3p_netlib_integer *n,
  v3p_netlib_doublereal *a,
  v3p_netlib_integer *lda,
  v3p_netlib_doublereal *x,
  v3p_netlib_integer *incx,
  v3p_netlib_ftnlen uplo_len,
  v3p_netlib_ftnlen trans_len,
  v3p_netlib_ftnlen diag_len
  );