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diff --git a/src/armadillo/include/armadillo_bits/spglue_kron_meat.hpp b/src/armadillo/include/armadillo_bits/spglue_kron_meat.hpp
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+++ b/src/armadillo/include/armadillo_bits/spglue_kron_meat.hpp
@@ -0,0 +1,159 @@
+// 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 spglue_kron
+//! @{
+
+
+
+template<typename T1, typename T2>
+inline
+void
+spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const unwrap_spmat<T1> UA(X.A);
+  const unwrap_spmat<T2> UB(X.B);
+  
+  if(UA.is_alias(out) || UB.is_alias(out))
+    {
+    SpMat<eT> tmp;
+    
+    spglue_kron::apply_noalias(tmp, UA.M, UB.M);
+    
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    spglue_kron::apply_noalias(out, UA.M, UB.M);
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spglue_kron::apply_noalias(SpMat<eT>& out, const SpMat<eT>& A, const SpMat<eT>& B)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword A_n_rows = A.n_rows;
+  const uword A_n_cols = A.n_cols;
+  
+  const uword B_n_rows = B.n_rows;
+  const uword B_n_cols = B.n_cols;
+  
+  const uword out_n_nonzero = A.n_nonzero * B.n_nonzero;
+  
+  out.reserve(A_n_rows * B_n_rows, A_n_cols * B_n_cols, out_n_nonzero);
+  
+  if(out_n_nonzero == 0)  { return; }
+  
+  access::rw(out.col_ptrs[0]) = 0;
+  
+  uword count = 0;
+  
+  for(uword A_col=0; A_col < A_n_cols; ++A_col)
+  for(uword B_col=0; B_col < B_n_cols; ++B_col)
+    {
+    for(uword A_i = A.col_ptrs[A_col]; A_i < A.col_ptrs[A_col+1]; ++A_i)
+      {
+      const uword out_row = A.row_indices[A_i] * B_n_rows;
+      
+      const eT A_val = A.values[A_i];
+      
+      for(uword B_i = B.col_ptrs[B_col]; B_i < B.col_ptrs[B_col+1]; ++B_i)
+        {
+        access::rw(out.values[count])      = A_val * B.values[B_i];
+        access::rw(out.row_indices[count]) = out_row + B.row_indices[B_i];
+        
+        count++;
+        }
+      }
+    
+    access::rw(out.col_ptrs[A_col * B_n_cols + B_col + 1]) = count;
+    }
+  }
+
+
+
+// template<typename T1, typename T2>
+// inline
+// void
+// spglue_kron::apply(SpMat<typename T1::elem_type>& out, const SpGlue<T1,T2,spglue_kron>& X)
+//   {
+//   arma_extra_debug_sigprint();
+//   
+//   typedef typename T1::elem_type eT;
+//   
+//   const unwrap_spmat<T1> UA(X.A);
+//   const unwrap_spmat<T2> UB(X.B);
+//   
+//   const SpMat<eT>& A = UA.M;
+//   const SpMat<eT>& B = UB.M;
+//   
+//   umat    locs(2, A.n_nonzero * B.n_nonzero, arma_nozeros_indicator());
+//   Col<eT> vals(   A.n_nonzero * B.n_nonzero, arma_nozeros_indicator());
+//   
+//   uword* locs_mem = locs.memptr();
+//   eT*    vals_mem = vals.memptr();
+//   
+//   typename SpMat<eT>::const_iterator A_it     = A.begin();
+//   typename SpMat<eT>::const_iterator A_it_end = A.end();
+//   
+//   typename SpMat<eT>::const_iterator B_it_start = B.begin();
+//   typename SpMat<eT>::const_iterator B_it_end   = B.end();
+//   
+//   const uword B_n_rows = B.n_rows;
+//   const uword B_n_cols = B.n_cols;
+//   
+//   uword i = 0;
+//   
+//   while(A_it != A_it_end)
+//     {
+//     typename SpMat<eT>::const_iterator B_it = B_it_start;
+//     
+//     const uword loc_row = A_it.row() * B_n_rows;
+//     const uword loc_col = A_it.col() * B_n_cols;
+//     
+//     const eT A_val = (*A_it);
+//     
+//     while(B_it != B_it_end)
+//       {
+//       (*locs_mem) = loc_row + B_it.row();  locs_mem++;
+//       (*locs_mem) = loc_col + B_it.col();  locs_mem++;
+//       
+//       vals_mem[i] = A_val * (*B_it);
+//       
+//       ++i;
+//       ++B_it;
+//       }
+//     
+//     ++A_it;
+//     }
+//   
+//   out = SpMat<eT>(locs, vals, A.n_rows*B.n_rows, A.n_cols*B.n_cols);
+//   }
+
+
+
+//! @}