So autopkgtest is happy
---
 test/testEvent_mpi.c    |    3 ++-
 test/testEvent_parall.c |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/test/testEvent_mpi.c
+++ b/test/testEvent_mpi.c
@@ -67,7 +67,8 @@ int main (int argc, char** argv){
 
     /* Initialisation */
     setTraceType (traceT);
-    fprintf (stderr, "Rank : %d \n", rank);
+    printf ("Rank : %d \n", rank);
+    fflush (stdout);
     CHECK_RETURN (initTrace ("testEvent_mpi", rank, GTG_FLAG_USE_MPI|GTG_FLAG_NOTBUF));
     if (rank==0){
         /* Creating types used */
--- a/test/testEvent_parall.c
+++ b/test/testEvent_parall.c
@@ -67,7 +67,8 @@ int main (int argc, char** argv){
 
     /* Initialisation */
     setTraceType (traceT);
-    fprintf (stderr, "Rank : %d \n", rank);
+    printf ("Rank : %d \n", rank);
+    fflush (stdout);
     CHECK_RETURN (initTrace ("testEvent_parallel", rank, GTG_FLAG_PAJE_MULTIPLE_FILES|GTG_FLAG_NOTBUF));
 
     if (rank==0){
