fix a compilation error when NS3 is activated

diff --git a/include/simgrid/datatypes.h b/include/simgrid/datatypes.h
index f93f536..035a6af 100644 (file)
--- a/include/simgrid/datatypes.h
+++ b/include/simgrid/datatypes.h
@@ -7,6 +7,8 @@
 #ifndef SIMGRID_DATATYPES_H_
 #define SIMGRID_DATATYPES_H_
 
+#include <simgrid/forward.h>
+
 typedef struct vm_params {
   int ncpus;
   sg_size_t ramsize;