finish the move to Eigen3 in BTL, and let's use our own FindEigen3.cmake script
diff --git a/bench/btl/CMakeLists.txt b/bench/btl/CMakeLists.txt
index 5855c0d..b7b2df3 100644
--- a/bench/btl/CMakeLists.txt
+++ b/bench/btl/CMakeLists.txt
@@ -89,7 +89,7 @@
 
 ENABLE_TESTING()
 
-add_subdirectory(libs/eigen2)
+add_subdirectory(libs/eigen3)
 add_subdirectory(libs/hand_vec)
 add_subdirectory(libs/gmm)
 add_subdirectory(libs/mtl4)
diff --git a/bench/btl/cmake/FindEigen.cmake b/bench/btl/cmake/FindEigen.cmake
deleted file mode 100644
index 1a5fe34..0000000
--- a/bench/btl/cmake/FindEigen.cmake
+++ /dev/null
@@ -1,30 +0,0 @@
-# - Try to find eigen lib
-# Once done this will define
-#
-#  EIGEN_FOUND - system has eigen lib
-#  EIGEN_INCLUDE_DIR - the eigen include directory
-
-# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
-# Redistribution and use is allowed according to the terms of the BSD license.
-# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
-
-if (EIGEN_INCLUDE_DIR)
-
-  # in cache already
-  set(EIGEN_FOUND TRUE)
-
-else (EIGEN_INCLUDE_DIR)
-
-find_path(EIGEN_INCLUDE_DIR NAMES eigen/matrix.h
-     PATHS
-     ${INCLUDE_INSTALL_DIR}
-   )
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(Eigen DEFAULT_MSG EIGEN_INCLUDE_DIR )
-
-
-mark_as_advanced(EIGEN_INCLUDE_DIR)
-
-endif(EIGEN_INCLUDE_DIR)
-
diff --git a/bench/btl/cmake/FindEigen2.cmake b/bench/btl/cmake/FindEigen2.cmake
deleted file mode 100644
index 5feddf3..0000000
--- a/bench/btl/cmake/FindEigen2.cmake
+++ /dev/null
@@ -1,32 +0,0 @@
-# - Try to find Eigen2 lib
-# Once done this will define
-#
-#  EIGEN2_FOUND - system has eigen lib
-#  EIGEN2_INCLUDE_DIR - the eigen include directory
-
-# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
-# Redistribution and use is allowed according to the terms of the BSD license.
-# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
-
-if (EIGEN2_INCLUDE_DIR)
-
-  # in cache already
-  set(EIGEN2_FOUND TRUE)
-
-else (EIGEN2_INCLUDE_DIR)
-
-find_path(EIGEN2_INCLUDE_DIR NAMES Eigen/Core
-     PATH_SUFFIXES eigen2
-     HINTS
-     ${INCLUDE_INSTALL_DIR}
-     ${KDE4_INCLUDE_DIR}
-   )
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(Eigen2 DEFAULT_MSG EIGEN2_INCLUDE_DIR )
-
-
-mark_as_advanced(EIGEN2_INCLUDE_DIR)
-
-endif(EIGEN2_INCLUDE_DIR)
-
diff --git a/bench/btl/cmake/FindEigen3.cmake b/bench/btl/cmake/FindEigen3.cmake
new file mode 100644
index 0000000..9c546a0
--- /dev/null
+++ b/bench/btl/cmake/FindEigen3.cmake
@@ -0,0 +1,81 @@
+# - Try to find Eigen3 lib
+#
+# This module supports requiring a minimum version, e.g. you can do
+#   find_package(Eigen3 3.1.2)
+# to require version 3.1.2 or newer of Eigen3.
+#
+# Once done this will define
+#
+#  EIGEN3_FOUND - system has eigen lib with correct version
+#  EIGEN3_INCLUDE_DIR - the eigen include directory
+#  EIGEN3_VERSION - eigen version
+
+# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
+# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
+# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
+
+if(NOT Eigen3_FIND_VERSION)
+  if(NOT Eigen3_FIND_VERSION_MAJOR)
+    set(Eigen3_FIND_VERSION_MAJOR 2)
+  endif(NOT Eigen3_FIND_VERSION_MAJOR)
+  if(NOT Eigen3_FIND_VERSION_MINOR)
+    set(Eigen3_FIND_VERSION_MINOR 91)
+  endif(NOT Eigen3_FIND_VERSION_MINOR)
+  if(NOT Eigen3_FIND_VERSION_PATCH)
+    set(Eigen3_FIND_VERSION_PATCH 0)
+  endif(NOT Eigen3_FIND_VERSION_PATCH)
+
+  set(Eigen3_FIND_VERSION "${Eigen3_FIND_VERSION_MAJOR}.${Eigen3_FIND_VERSION_MINOR}.${Eigen3_FIND_VERSION_PATCH}")
+endif(NOT Eigen3_FIND_VERSION)
+
+macro(_eigen3_check_version)
+  file(READ "${EIGEN3_INCLUDE_DIR}/Eigen/src/Core/util/Macros.h" _eigen3_version_header)
+
+  string(REGEX MATCH "define[ \t]+EIGEN_WORLD_VERSION[ \t]+([0-9]+)" _eigen3_world_version_match "${_eigen3_version_header}")
+  set(EIGEN3_WORLD_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+EIGEN_MAJOR_VERSION[ \t]+([0-9]+)" _eigen3_major_version_match "${_eigen3_version_header}")
+  set(EIGEN3_MAJOR_VERSION "${CMAKE_MATCH_1}")
+  string(REGEX MATCH "define[ \t]+EIGEN_MINOR_VERSION[ \t]+([0-9]+)" _eigen3_minor_version_match "${_eigen3_version_header}")
+  set(EIGEN3_MINOR_VERSION "${CMAKE_MATCH_1}")
+
+  set(EIGEN3_VERSION ${EIGEN3_WORLD_VERSION}.${EIGEN3_MAJOR_VERSION}.${EIGEN3_MINOR_VERSION})
+  if(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+    set(EIGEN3_VERSION_OK FALSE)
+  else(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+    set(EIGEN3_VERSION_OK TRUE)
+  endif(${EIGEN3_VERSION} VERSION_LESS ${Eigen3_FIND_VERSION})
+
+  if(NOT EIGEN3_VERSION_OK)
+
+    message(STATUS "Eigen3 version ${EIGEN3_VERSION} found in ${EIGEN3_INCLUDE_DIR}, "
+                   "but at least version ${Eigen3_FIND_VERSION} is required")
+  endif(NOT EIGEN3_VERSION_OK)
+endmacro(_eigen3_check_version)
+
+if (EIGEN3_INCLUDE_DIR)
+
+  # in cache already
+  _eigen3_check_version()
+  set(EIGEN3_FOUND ${EIGEN3_VERSION_OK})
+
+else (EIGEN3_INCLUDE_DIR)
+
+  find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
+      PATHS
+      ${CMAKE_INSTALL_PREFIX}/include
+      ${KDE4_INCLUDE_DIR}
+      PATH_SUFFIXES eigen3 eigen
+    )
+
+  if(EIGEN3_INCLUDE_DIR)
+    _eigen3_check_version()
+  endif(EIGEN3_INCLUDE_DIR)
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(Eigen3 DEFAULT_MSG EIGEN3_INCLUDE_DIR EIGEN3_VERSION_OK)
+
+  mark_as_advanced(EIGEN3_INCLUDE_DIR)
+
+endif(EIGEN3_INCLUDE_DIR)
+
diff --git a/bench/btl/libs/eigen2/eigen2_LU_solve_interface.hh b/bench/btl/libs/eigen2/eigen2_LU_solve_interface.hh
deleted file mode 100644
index dcb9f56..0000000
--- a/bench/btl/libs/eigen2/eigen2_LU_solve_interface.hh
+++ /dev/null
@@ -1,192 +0,0 @@
-//=====================================================
-// File   :  blitz_LU_solve_interface.hh
-// Author :  L. Plagne <laurent.plagne@edf.fr)>        
-// Copyright (C) EDF R&D,  lun sep 30 14:23:31 CEST 2002
-//=====================================================
-// 
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
-// 
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
-// 
-#ifndef BLITZ_LU_SOLVE_INTERFACE_HH
-#define BLITZ_LU_SOLVE_INTERFACE_HH
-
-#include "blitz/array.h"
-#include <vector>
-
-BZ_USING_NAMESPACE(blitz)
-
-template<class real>
-class blitz_LU_solve_interface : public blitz_interface<real>
-{
-
-public :
-
-  typedef typename blitz_interface<real>::gene_matrix gene_matrix;
-  typedef typename blitz_interface<real>::gene_vector gene_vector;
-
-  typedef blitz::Array<int,1> Pivot_Vector;
-
-  inline static void new_Pivot_Vector(Pivot_Vector & pivot,int N)
-  {
-
-    pivot.resize(N);
-
-  }
-
-  inline static void free_Pivot_Vector(Pivot_Vector & pivot)
-  {
-    
-    return;
-
-  }
-
-
-  static inline real matrix_vector_product_sliced(const gene_matrix & A, gene_vector B, int row, int col_start, int col_end)
-  {
-    
-    real somme=0.;
-    
-    for (int j=col_start ; j<col_end+1 ; j++){
-	
-	somme+=A(row,j)*B(j);
-	
-    }
-
-    return somme;
-
-  }
-
-
-
-
-  static inline real matrix_matrix_product_sliced(gene_matrix & A, int row, int col_start, int col_end, gene_matrix & B, int row_shift, int col )
-  {
-    
-    real somme=0.;
-    
-    for (int j=col_start ; j<col_end+1 ; j++){
-	
-	somme+=A(row,j)*B(j+row_shift,col);
-	
-    }
-
-    return somme;
-
-  }
-
-  inline static void LU_factor(gene_matrix & LU, Pivot_Vector & pivot, int N)
-  {
-
-    ASSERT( LU.rows()==LU.cols() ) ;
-    int index_max = 0 ;
-    real big = 0. ;
-    real theSum = 0. ;
-    real dum = 0. ;
-    // Get the implicit scaling information :
-    gene_vector ImplicitScaling( N ) ;
-    for( int i=0; i<N; i++ ) {
-      big = 0. ;
-      for( int j=0; j<N; j++ ) {
-	if( abs( LU( i, j ) )>=big ) big = abs( LU( i, j ) ) ;
-      }
-      if( big==0. ) {
-	INFOS( "blitz_LU_factor::Singular matrix" ) ;
-	exit( 0 ) ;
-      }
-      ImplicitScaling( i ) = 1./big ;
-    }
-    // Loop over columns of Crout's method :
-    for( int j=0; j<N; j++ ) {
-      for( int i=0; i<j; i++ ) {
-	theSum = LU( i, j ) ;
-	theSum -= matrix_matrix_product_sliced(LU, i, 0, i-1, LU, 0, j) ;
-	//	theSum -= sum( LU( i, Range( fromStart, i-1 ) )*LU( Range( fromStart, i-1 ), j ) ) ;
-	LU( i, j ) = theSum ;
-      }
-      
-      // Search for the largest pivot element :
-      big = 0. ;
-      for( int i=j; i<N; i++ ) {
-	theSum = LU( i, j ) ;
-	theSum -= matrix_matrix_product_sliced(LU, i, 0, j-1, LU, 0, j) ;
-	//	theSum -= sum( LU( i, Range( fromStart, j-1 ) )*LU( Range( fromStart, j-1 ), j ) ) ;
-	LU( i, j ) = theSum ;
-	if( (ImplicitScaling( i )*abs( theSum ))>=big ) {
-	  dum = ImplicitScaling( i )*abs( theSum ) ;
-	  big = dum ;
-	  index_max = i ;
-	}
-      }
-      // Interchanging rows and the scale factor :
-      if( j!=index_max ) {
-	for( int k=0; k<N; k++ ) {
-	  dum = LU( index_max, k ) ;
-	  LU( index_max, k ) = LU( j, k ) ;
-	  LU( j, k ) = dum ;
-	}
-	ImplicitScaling( index_max ) = ImplicitScaling( j ) ;
-      }
-      pivot( j ) = index_max ;
-      if ( LU( j, j )==0. ) LU( j, j ) = 1.e-20 ;
-      // Divide by the pivot element :
-      if( j<N ) {
-	dum = 1./LU( j, j ) ;
-	for( int i=j+1; i<N; i++ ) LU( i, j ) *= dum ;
-      }
-    }
-
-  }
-
-  inline static void LU_solve(const gene_matrix & LU, const Pivot_Vector pivot, gene_vector &B, gene_vector X, int N)
-  {
-
-    // Pour conserver le meme header, on travaille sur X, copie du second-membre B
-    X = B.copy() ;
-    ASSERT( LU.rows()==LU.cols() ) ;
-    firstIndex indI ;
-    // Forward substitution :
-    int ii = 0 ;
-    real theSum = 0. ;
-    for( int i=0; i<N; i++ ) {
-      int ip = pivot( i ) ;
-      theSum = X( ip ) ;
-      //      theSum = B( ip ) ;
-      X( ip ) = X( i ) ;
-      //      B( ip ) = B( i ) ;
-      if( ii ) {
-	theSum -= matrix_vector_product_sliced(LU, X, i, ii-1, i-1) ;
-	//	theSum -= sum( LU( i, Range( ii-1, i-1 ) )*X( Range( ii-1, i-1 ) ) ) ;
-	//	theSum -= sum( LU( i, Range( ii-1, i-1 ) )*B( Range( ii-1, i-1 ) ) ) ;
-      } else if( theSum ) {
-	ii = i+1 ;
-      }
-      X( i ) = theSum ;
-      //      B( i ) = theSum ;
-    }
-    // Backsubstitution :
-    for( int i=N-1; i>=0; i-- ) {
-      theSum = X( i ) ;
-      //      theSum = B( i ) ;
-      theSum -= matrix_vector_product_sliced(LU, X, i, i+1, N) ;
-      //      theSum -= sum( LU( i, Range( i+1, toEnd ) )*X( Range( i+1, toEnd ) ) ) ;
-      //      theSum -= sum( LU( i, Range( i+1, toEnd ) )*B( Range( i+1, toEnd ) ) ) ;
-      // Store a component of the solution vector :
-      X( i ) = theSum/LU( i, i ) ;
-      //      B( i ) = theSum/LU( i, i ) ;
-    }
-
-  }
-
-};
-
-#endif
diff --git a/bench/btl/libs/eigen2/CMakeLists.txt b/bench/btl/libs/eigen3/CMakeLists.txt
similarity index 96%
rename from bench/btl/libs/eigen2/CMakeLists.txt
rename to bench/btl/libs/eigen3/CMakeLists.txt
index eb1659b..334eb14 100644
--- a/bench/btl/libs/eigen2/CMakeLists.txt
+++ b/bench/btl/libs/eigen3/CMakeLists.txt
@@ -1,8 +1,8 @@
 
-find_package(Eigen)
-if (EIGEN_FOUND)
+find_package(Eigen3)
+if (EIGEN3_FOUND)
 
-  include_directories(${EIGEN_INCLUDE_DIR})
+  include_directories(${EIGEN3_INCLUDE_DIR})
   btl_add_bench(btl_eigen3_linear main_linear.cpp)
   btl_add_bench(btl_eigen3_vecmat main_vecmat.cpp)
   btl_add_bench(btl_eigen3_matmat main_matmat.cpp)
@@ -54,4 +54,4 @@
     endif(BUILD_btl_tiny_eigen3_novec)
   endif(NOT BTL_NOVEC)
 
-endif (EIGEN_FOUND)
+endif (EIGEN3_FOUND)
diff --git a/bench/btl/libs/eigen2/btl_tiny_eigen2.cpp b/bench/btl/libs/eigen3/btl_tiny_eigen3.cpp
similarity index 97%
rename from bench/btl/libs/eigen2/btl_tiny_eigen2.cpp
rename to bench/btl/libs/eigen3/btl_tiny_eigen3.cpp
index 0e2c32f..d1515be 100644
--- a/bench/btl/libs/eigen2/btl_tiny_eigen2.cpp
+++ b/bench/btl/libs/eigen3/btl_tiny_eigen3.cpp
@@ -16,7 +16,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
 #include "utilities.h"
-#include "eigen2_interface.hh"
+#include "eigen3_interface.hh"
 #include "static/bench_static.hh"
 #include "action_matrix_vector_product.hh"
 #include "action_matrix_matrix_product.hh"
diff --git a/bench/btl/libs/eigen2/eigen2_interface.hh b/bench/btl/libs/eigen3/eigen3_interface.hh
similarity index 98%
rename from bench/btl/libs/eigen2/eigen2_interface.hh
rename to bench/btl/libs/eigen3/eigen3_interface.hh
index ae28000..bd5eb4b 100644
--- a/bench/btl/libs/eigen2/eigen2_interface.hh
+++ b/bench/btl/libs/eigen3/eigen3_interface.hh
@@ -15,8 +15,8 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
-#ifndef EIGEN2_INTERFACE_HH
-#define EIGEN2_INTERFACE_HH
+#ifndef EIGEN3_INTERFACE_HH
+#define EIGEN3_INTERFACE_HH
 
 #include <Eigen/Eigen>
 #include <vector>
@@ -25,7 +25,7 @@
 using namespace Eigen;
 
 template<class real, int SIZE=Dynamic>
-class eigen2_interface
+class eigen3_interface
 {
 
 public :
diff --git a/bench/btl/libs/eigen2/main_adv.cpp b/bench/btl/libs/eigen3/main_adv.cpp
similarity index 73%
rename from bench/btl/libs/eigen2/main_adv.cpp
rename to bench/btl/libs/eigen3/main_adv.cpp
index 1f42962..efe5857 100644
--- a/bench/btl/libs/eigen2/main_adv.cpp
+++ b/bench/btl/libs/eigen3/main_adv.cpp
@@ -16,7 +16,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
 #include "utilities.h"
-#include "eigen2_interface.hh"
+#include "eigen3_interface.hh"
 #include "bench.hh"
 #include "action_trisolve.hh"
 #include "action_trisolve_matrix.hh"
@@ -29,14 +29,14 @@
 
 int main()
 {
-  bench<Action_trisolve<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_trisolve_matrix<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_cholesky<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_lu_decomp<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_partial_lu<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_trisolve<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_trisolve_matrix<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_cholesky<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_lu_decomp<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_partial_lu<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
 
-  bench<Action_hessenberg<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_tridiagonalization<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_hessenberg<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_tridiagonalization<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
 
   return 0;
 }
diff --git a/bench/btl/libs/eigen2/main_linear.cpp b/bench/btl/libs/eigen3/main_linear.cpp
similarity index 82%
rename from bench/btl/libs/eigen2/main_linear.cpp
rename to bench/btl/libs/eigen3/main_linear.cpp
index 35dce7b..e8538b7 100644
--- a/bench/btl/libs/eigen2/main_linear.cpp
+++ b/bench/btl/libs/eigen3/main_linear.cpp
@@ -16,7 +16,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
 #include "utilities.h"
-#include "eigen2_interface.hh"
+#include "eigen3_interface.hh"
 #include "bench.hh"
 #include "basic_actions.hh"
 
@@ -25,9 +25,9 @@
 int main()
 {
 
-  bench<Action_axpy<eigen2_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
-  bench<Action_axpby<eigen2_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
-  bench<Action_rot<eigen2_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
+  bench<Action_axpy<eigen3_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
+  bench<Action_axpby<eigen3_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
+  bench<Action_rot<eigen3_interface<REAL_TYPE> > >(MIN_AXPY,MAX_AXPY,NB_POINT);
   
   return 0;
 }
diff --git a/bench/btl/libs/eigen2/main_matmat.cpp b/bench/btl/libs/eigen3/main_matmat.cpp
similarity index 79%
rename from bench/btl/libs/eigen2/main_matmat.cpp
rename to bench/btl/libs/eigen3/main_matmat.cpp
index ac3fe8d..052810a 100644
--- a/bench/btl/libs/eigen2/main_matmat.cpp
+++ b/bench/btl/libs/eigen3/main_matmat.cpp
@@ -16,7 +16,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
 #include "utilities.h"
-#include "eigen2_interface.hh"
+#include "eigen3_interface.hh"
 #include "bench.hh"
 #include "basic_actions.hh"
 
@@ -24,10 +24,10 @@
 
 int main()
 {
-  bench<Action_matrix_matrix_product<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_ata_product<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_aat_product<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
-  bench<Action_trmm<eigen2_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_matrix_matrix_product<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_ata_product<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_aat_product<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
+  bench<Action_trmm<eigen3_interface<REAL_TYPE> > >(MIN_MM,MAX_MM,NB_POINT);
 
   return 0;
 }
diff --git a/bench/btl/libs/eigen2/main_vecmat.cpp b/bench/btl/libs/eigen3/main_vecmat.cpp
similarity index 75%
rename from bench/btl/libs/eigen2/main_vecmat.cpp
rename to bench/btl/libs/eigen3/main_vecmat.cpp
index 50c0669..0dda444 100644
--- a/bench/btl/libs/eigen2/main_vecmat.cpp
+++ b/bench/btl/libs/eigen3/main_vecmat.cpp
@@ -16,7 +16,7 @@
 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 //
 #include "utilities.h"
-#include "eigen2_interface.hh"
+#include "eigen3_interface.hh"
 #include "bench.hh"
 #include "basic_actions.hh"
 
@@ -24,11 +24,11 @@
 
 int main()
 {
-  bench<Action_matrix_vector_product<eigen2_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
-  bench<Action_atv_product<eigen2_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
-  bench<Action_symv<eigen2_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
-  bench<Action_syr2<eigen2_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
-  bench<Action_ger<eigen2_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
+  bench<Action_matrix_vector_product<eigen3_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
+  bench<Action_atv_product<eigen3_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
+  bench<Action_symv<eigen3_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
+  bench<Action_syr2<eigen3_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
+  bench<Action_ger<eigen3_interface<REAL_TYPE> > >(MIN_MV,MAX_MV,NB_POINT);
 
   return 0;
 }