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diff --git a/src/armadillo/include/armadillo_bits/gmm_misc_meat.hpp b/src/armadillo/include/armadillo_bits/gmm_misc_meat.hpp
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index 0000000..3276b46
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/gmm_misc_meat.hpp
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup gmm_misc
+//! @{
+
+
+namespace gmm_priv
+{
+
+
+template<typename eT>
+inline
+running_mean_scalar<eT>::running_mean_scalar()
+  : counter(uword(0))
+  , r_mean (   eT(0))
+  {
+  arma_extra_debug_sigprint_this(this);
+  }
+
+
+
+template<typename eT>
+inline
+running_mean_scalar<eT>::running_mean_scalar(const running_mean_scalar<eT>& in)
+  : counter(in.counter)
+  , r_mean (in.r_mean )
+  {
+  arma_extra_debug_sigprint_this(this);
+  }
+
+
+
+template<typename eT>
+inline
+const running_mean_scalar<eT>&
+running_mean_scalar<eT>::operator=(const running_mean_scalar<eT>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  counter = in.counter;
+  r_mean  = in.r_mean;
+  
+  return *this;
+  }
+
+
+
+template<typename eT>
+inline
+void
+running_mean_scalar<eT>::operator() (const eT X)
+  {
+  arma_extra_debug_sigprint();
+  
+  counter++;
+  
+  if(counter > 1)
+    {
+    const eT old_r_mean = r_mean;
+    
+    r_mean = old_r_mean + (X - old_r_mean)/counter;
+    }
+  else
+    {
+    r_mean = X;
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+running_mean_scalar<eT>::reset()
+  {
+  arma_extra_debug_sigprint();
+  
+  counter = 0;
+  r_mean  = eT(0);
+  }
+
+
+
+template<typename eT>
+inline
+uword
+running_mean_scalar<eT>::count() const
+  {
+  return counter;
+  }
+
+
+
+template<typename eT>
+inline
+eT
+running_mean_scalar<eT>::mean() const
+  {
+  return r_mean;
+  }
+
+
+
+//
+//
+//
+
+
+
+template<typename eT>
+arma_inline
+eT
+distance<eT, uword(1)>::eval(const uword N, const eT* A, const eT* B, const eT*)
+  {
+  eT acc1 = eT(0);
+  eT acc2 = eT(0);
+  
+  uword i,j;
+  for(i=0, j=1; j<N; i+=2, j+=2)
+    {
+    eT tmp_i = A[i];
+    eT tmp_j = A[j];
+    
+    tmp_i -= B[i];
+    tmp_j -= B[j];
+    
+    acc1 += tmp_i*tmp_i;
+    acc2 += tmp_j*tmp_j;
+    }
+  
+  if(i < N)
+    {
+    const eT tmp_i = A[i] - B[i];
+    
+    acc1 += tmp_i*tmp_i;
+    }
+  
+  return (acc1 + acc2);
+  }
+
+
+
+template<typename eT>
+arma_inline
+eT
+distance<eT, uword(2)>::eval(const uword N, const eT* A, const eT* B, const eT* C)
+  {
+  eT acc1 = eT(0);
+  eT acc2 = eT(0);
+  
+  uword i,j;
+  for(i=0, j=1; j<N; i+=2, j+=2)
+    {
+    eT tmp_i = A[i];
+    eT tmp_j = A[j];
+    
+    tmp_i -= B[i];
+    tmp_j -= B[j];
+    
+    acc1 += (tmp_i*tmp_i) * C[i];
+    acc2 += (tmp_j*tmp_j) * C[j];
+    }
+  
+  if(i < N)
+    {
+    const eT tmp_i = A[i] - B[i];
+    
+    acc1 += (tmp_i*tmp_i) * C[i];
+    }
+  
+  return (acc1 + acc2);
+  }
+
+}
+
+
+//! @}