fix precise build (followup 8df09a6)

jef-n · jef-n · commit bde0f10c7f56 · 2016-01-06T08:39:06.000+01:00
diff --git a/src/core/pal/rtree.hpp b/src/core/pal/rtree.hpp
@@ -17,6 +17,7 @@
 #ifndef RTREE_H
 #define RTREE_H
 
+#include <cstdio>
 #include <cmath>
 #include <cassert>
 #include <QtGlobal>
