ros-indigo-stage.patch

--- ./stage/libstage/world.cc   2016-05-22 17:32:56.876610943 +0300
+++ ./stage/libstage/world.cc   2016-05-22 17:31:35.593280198 +0300
@@ -803,8 +803,8 @@
   // Graphics Gems IV
   const int32_t sx(sgn(dx));
   const int32_t sy(sgn(dy));
-  const int32_t ax(abs(dx));
-  const int32_t ay(abs(dy));
+  const int32_t ax(abs((int32_t)dx));
+  const int32_t ay(abs((int32_t)dy));
   const int32_t bx(2*ax);
   const int32_t by(2*ay);
   int32_t exy(ay-ax); // difference between x and y distances