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diff --git a/thirdparty/includes/GSL/gsl/gsl_splinalg.h b/thirdparty/includes/GSL/gsl/gsl_splinalg.h
new file mode 100644
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+++ b/thirdparty/includes/GSL/gsl/gsl_splinalg.h
@@ -0,0 +1,79 @@
+/* gsl_splinalg.h
+ * 
+ * Copyright (C) 2012-2014 Patrick Alken
+ * 
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GSL_SPLINALG_H__
+#define __GSL_SPLINALG_H__
+
+#include <gsl/gsl_math.h>
+#include <gsl/gsl_vector.h>
+#include <gsl/gsl_matrix.h>
+#include <gsl/gsl_spmatrix.h>
+#include <gsl/gsl_linalg.h>
+#include <gsl/gsl_types.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+/* iteration solver type */
+typedef struct
+{
+  const char *name;
+  void * (*alloc) (const size_t n, const size_t m);
+  int (*iterate) (const gsl_spmatrix *A, const gsl_vector *b,
+                  const double tol, gsl_vector *x, void *);
+  double (*normr)(const void *);
+  void (*free) (void *);
+} gsl_splinalg_itersolve_type;
+
+typedef struct
+{
+  const gsl_splinalg_itersolve_type * type;
+  double normr; /* current residual norm || b - A x || */
+  void * state;
+} gsl_splinalg_itersolve;
+
+/* available types */
+GSL_VAR const gsl_splinalg_itersolve_type * gsl_splinalg_itersolve_gmres;
+
+/*
+ * Prototypes
+ */
+gsl_splinalg_itersolve *
+gsl_splinalg_itersolve_alloc(const gsl_splinalg_itersolve_type *T,
+                             const size_t n, const size_t m);
+void gsl_splinalg_itersolve_free(gsl_splinalg_itersolve *w);
+const char *gsl_splinalg_itersolve_name(const gsl_splinalg_itersolve *w);
+int gsl_splinalg_itersolve_iterate(const gsl_spmatrix *A,
+                                   const gsl_vector *b,
+                                   const double tol, gsl_vector *x,
+                                   gsl_splinalg_itersolve *w);
+double gsl_splinalg_itersolve_normr(const gsl_splinalg_itersolve *w);
+
+__END_DECLS
+
+#endif /* __GSL_SPLINALG_H__ */