diff -r 62a9d46303d9 -r 046c055217f6 demo/descriptor_map_demo.cc
--- a/demo/descriptor_map_demo.cc	Fri Feb 08 09:56:46 2008 +0000
+++ b/demo/descriptor_map_demo.cc	Fri Feb 08 10:18:55 2008 +0000
@@ -61,7 +61,7 @@
     : descriptor(_graph), center(_center), radius(_radius) {}
 
   Value operator[](const Key& key) const {
-    double angle = descriptor[key] * 2 * M_PI 
+    double angle = descriptor[key] * 2 * PI 
       / double(descriptor.inverse().size());
     double x = std::cos(angle) * radius + center.x;
     double y = std::sin(angle) * radius + center.y;