#include <math.h>
#include "break-align-interface.hh"
-#include "libc-extension.hh" // isinf
+#include "libc-extension.hh" // isinf
+#include "pointer-group-interface.hh"
#include "self-alignment-interface.hh"
#include "side-position-interface.hh"
#include "axis-group-interface.hh"