diff --git a/Examples/java/mpointer/example.cxx b/Examples/java/mpointer/example.cxx
index 1a6bb666a..80d95f618 100644
--- a/Examples/java/mpointer/example.cxx
+++ b/Examples/java/mpointer/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
diff --git a/Examples/php4/shadow/example.cxx b/Examples/php4/shadow/example.cxx
index d7f5046fe..bf088228f 100644
--- a/Examples/php4/shadow/example.cxx
+++ b/Examples/php4/shadow/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
diff --git a/Examples/python/mpointer/example.cxx b/Examples/python/mpointer/example.cxx
index 1a6bb666a..80d95f618 100644
--- a/Examples/python/mpointer/example.cxx
+++ b/Examples/python/mpointer/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
diff --git a/Examples/python/shadow/example.cxx b/Examples/python/shadow/example.cxx
index 21582f4d1..92a3add45 100644
--- a/Examples/python/shadow/example.cxx
+++ b/Examples/python/shadow/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
diff --git a/Examples/python/smartptr/example.cxx b/Examples/python/smartptr/example.cxx
index 21582f4d1..92a3add45 100644
--- a/Examples/python/smartptr/example.cxx
+++ b/Examples/python/smartptr/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {
diff --git a/Examples/ruby/mpointer/example.cxx b/Examples/ruby/mpointer/example.cxx
index 1a6bb666a..80d95f618 100644
--- a/Examples/ruby/mpointer/example.cxx
+++ b/Examples/ruby/mpointer/example.cxx
@@ -2,6 +2,9 @@
 
 #include "example.h"
 #include <math.h>
+#ifndef M_PI
+#  define M_PI 3.14159265358979323846
+#endif
 
 /* Move the shape to a new location */
 void Shape::move(double dx, double dy) {