Arrays with dynamic sizes is a gnu extension and not standard-compliant.

AMDiS/src/parallel/StdMpi.h

@@ -405,7 +405,7 @@ namespace AMDiS {
     {
       FUNCNAME("StdMpi::commDataSize()");
 
-      MPI::Request request[sendData.size() + recvDataSize.size()];
+      MPI::Request* request= new MPI::Request[sendData.size() + recvDataSize.size()];
       vector<int> sendBuffers;
       sendBuffers.resize(sendDataSize.size());
 
@@ -432,6 +432,8 @@ namespace AMDiS {
       bool testall = MPI::Request::Testall(requestCounter, request);
       TEST_EXIT(testall)("Should not happen!\n");
 #endif
+
+      delete[] request;
     }