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/usr/include/ITK-4.9/blas/snrm2.h is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.

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extern v3p_netlib_doublereal v3p_netlib_snrm2_(
  v3p_netlib_integer *n,
  v3p_netlib_real *x,
  v3p_netlib_integer *incx
  );