Make new gcc happy (include cmath)

diff --git a/simgear/canvas/elements/CanvasElement.cxx b/simgear/canvas/elements/CanvasElement.cxx
index 30601e77999ca0ceb428bc62c6eb860a7f4ccac0..49c7a47b50288c3844b80a5fca1a2f03c36f0fbc 100644 (file)
--- a/simgear/canvas/elements/CanvasElement.cxx
+++ b/simgear/canvas/elements/CanvasElement.cxx
@@ -32,6 +32,7 @@
 #include <boost/make_shared.hpp>
 
 #include <cassert>
+#include <cmath>
 #include <cstring>
 
 namespace simgear