Norman Vine writes: > > Jan Kolar writes: > > > > > ../index/quadtree/QuadTreeNode.cpp:175: implicit declaration of function > > `int geos::sprintf(...)' > > This wants to call the global sprintf as below > > ::sprintf(buf, "%d", level); That's true but the problem is that stdio.h isn't being included so to the top of the file add #include <stdio.h>