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diff --git a/src/fastblas.h b/src/fastblas.h
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+/*
+    Genome-wide Efficient Mixed Model Association (GEMMA)
+    Copyright © 2011-2017, Xiang Zhou
+    Copyright © 2017, Peter Carbonetto
+    Copyright © 2017, Pjotr Prins
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __FASTBLAS_H__
+#define __FASTBLAS_H__
+
+#include <assert.h>
+#include <iostream>
+#include "gsl/gsl_matrix.h"
+
+gsl_matrix *fast_copy(gsl_matrix *m, const double *mem);
+
+void fast_dgemm(const char *TransA, const char *TransB, const double alpha,
+                const gsl_matrix *A, const gsl_matrix *B, const double beta,
+                gsl_matrix *C);
+void fast_eigen_dgemm(const char *TransA, const char *TransB, const double alpha,
+                      const gsl_matrix *A, const gsl_matrix *B, const double beta,
+                      gsl_matrix *C);
+
+#endif