diff --git a/dynare++/integ/cc/vector_function.cweb b/dynare++/integ/cc/vector_function.cweb
index d84274180..e2197f541 100644
--- a/dynare++/integ/cc/vector_function.cweb
+++ b/dynare++/integ/cc/vector_function.cweb
@@ -14,6 +14,18 @@
 #include <cstring>
 #include <algorithm>
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#endif
+
 @<|ParameterSignal| constructor code@>;
 @<|ParameterSignal| copy constructor code@>;
 @<|ParameterSignal::signalAfter| code@>;
diff --git a/dynare++/kord/global_check.cweb b/dynare++/kord/global_check.cweb
index ea7782153..0c6195a6d 100644
--- a/dynare++/kord/global_check.cweb
+++ b/dynare++/kord/global_check.cweb
@@ -12,6 +12,18 @@
 #include "product.h"
 #include "quasi_mcarlo.h"
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#endif
+
 @<|ResidFunction| constructor code@>;
 @<|ResidFunction| copy constructor code@>;
 @<|ResidFunction| destructor code@>;
diff --git a/dynare++/parser/cc/tree.cpp b/dynare++/parser/cc/tree.cpp
index 8ff4267c6..3ab37e776 100644
--- a/dynare++/parser/cc/tree.cpp
+++ b/dynare++/parser/cc/tree.cpp
@@ -10,6 +10,19 @@
 #include <cmath>
 #include <limits>
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#endif
+
+
 using namespace ogp;
 
 
diff --git a/mex/sources/qzcomplex/qzcomplex.cc b/mex/sources/qzcomplex/qzcomplex.cc
index cfd13cfa7..7b95ce76f 100644
--- a/mex/sources/qzcomplex/qzcomplex.cc
+++ b/mex/sources/qzcomplex/qzcomplex.cc
@@ -6,7 +6,7 @@
  */
 
 /*
- * Copyright (C) 2010-2012 Dynare Team
+ * Copyright (C) 2010-2016 Dynare Team
  *
  * This file is part of Dynare.
  *
@@ -24,6 +24,18 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#endif
+
 #include <octave/oct.h>
 #include <octave/f77-fcn.h>
 
diff --git a/mex/sources/sobol/gaussian.hh b/mex/sources/sobol/gaussian.hh
index 2fee95097..450611773 100644
--- a/mex/sources/sobol/gaussian.hh
+++ b/mex/sources/sobol/gaussian.hh
@@ -2,7 +2,7 @@
 ** 
 ** Pseudo code of the algorithm is given at http://home.online.no/~pjacklam/notes/invnorm  
 **
-** Copyright (C) 2010-2011 Dynare Team
+** Copyright (C) 2010-2016 Dynare Team
 **
 ** This file is part of Dynare.
 **
@@ -40,6 +40,18 @@ using namespace std;
 #endif
 #define DEBUG_OMP 0
 
+#ifdef __MINGW32__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __MINGW64__
+#define __CROSS_COMPILATION__
+#endif
+
+#ifdef __CROSS_COMPILATION__
+#define M_PI 3.14159265358979323846
+#endif
+
 template<typename T> T icdf( const T uniform )
 /*
 **  This function invert the gaussian cumulative distribution function.