exit is defined in cstdlib

[[Imported from SVN: r5228]]

common/test/smartpointertest.cc

@@ -6,6 +6,7 @@
 #include <dune/common/smartpointer.hh>
 #include <iostream>
 #include <vector>
+#include <cstdlib>
 
 int main(){
   using namespace Dune;