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diff --git a/blas/common.h b/blas/common.h
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009 Gael Guennebaud <g.gael@free.fr>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, 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.
+//
+// Eigen 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 Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_BLAS_COMMON_H
+#define EIGEN_BLAS_COMMON_H
+
+#ifndef SCALAR
+#error the token SCALAR must be defined to compile this file
+#endif
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <blas.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#define NOTR    0
+#define TR      1
+#define ADJ     2
+
+#define LEFT    0
+#define RIGHT   1
+
+#define UP      0
+#define LO      1
+
+#define NUNIT   0
+#define UNIT    1
+
+#define OP(X)   (   ((X)=='N' || (X)=='n') ? NOTR   \
+                  : ((X)=='T' || (X)=='t') ? TR     \
+                  : ((X)=='C' || (X)=='c') ? ADJ    \
+                  : 0xff)
+
+#define SIDE(X) (   ((X)=='L' || (X)=='l') ? LEFT   \
+                  : ((X)=='R' || (X)=='r') ? RIGHT  \
+                  : 0xff)
+
+#define UPLO(X) (   ((X)=='U' || (X)=='u') ? UP     \
+                  : ((X)=='L' || (X)=='l') ? LO     \
+                  : 0xff)
+
+#define DIAG(X) (   ((X)=='N' || (X)=='N') ? NUNIT  \
+                  : ((X)=='U' || (X)=='u') ? UNIT   \
+                  : 0xff)
+
+#include <Eigen/Core>
+#include <Eigen/Jacobi>
+using namespace Eigen;
+
+template<typename T>
+Block<NestByValue<Map<Matrix<T,Dynamic,Dynamic> > >, Dynamic, Dynamic>
+matrix(T* data, int rows, int cols, int stride)
+{
+  return Map<Matrix<T,Dynamic,Dynamic> >(data, stride, cols).nestByValue().block(0,0,rows,cols);
+}
+
+template<typename T>
+Block<NestByValue<Map<Matrix<T,Dynamic,Dynamic,RowMajor> > >, Dynamic, 1>
+vector(T* data, int size, int incr)
+{
+  return Map<Matrix<T,Dynamic,Dynamic,RowMajor> >(data, size, incr).nestByValue().col(0);
+}
+
+template<typename T>
+Map<Matrix<T,Dynamic,1> >
+vector(T* data, int size)
+{
+  return Map<Matrix<T,Dynamic,1> >(data, size);
+}
+
+typedef SCALAR Scalar;
+typedef NumTraits<Scalar>::Real RealScalar;
+typedef std::complex<RealScalar> Complex;
+
+enum
+{
+  IsComplex = Eigen::NumTraits<SCALAR>::IsComplex,
+  Conj = IsComplex
+};
+
+typedef Block<NestByValue<Map<Matrix<Scalar,Dynamic,Dynamic> > >, Dynamic, Dynamic> MatrixType;
+typedef Block<NestByValue<Map<Matrix<Scalar,Dynamic,Dynamic, RowMajor> > >, Dynamic, 1> StridedVectorType;
+typedef Map<Matrix<Scalar,Dynamic,1> > CompactVectorType;
+
+#define EIGEN_BLAS_FUNC(X) EIGEN_CAT(SCALAR_SUFFIX,X##_)
+
+#endif // EIGEN_BLAS_COMMON_H