--- VTK/ThirdParty/xdmf2/vtkxdmf2/libsrc/XdmfDsmComm.cxx.orig	2017-04-06 01:46:47.367890000 +0700
+++ VTK/ThirdParty/xdmf2/vtkxdmf2/libsrc/XdmfDsmComm.cxx	2017-04-06 01:50:23.804236000 +0700
@@ -52,7 +52,7 @@
         XdmfErrorMessage("Cannot Receive Message of Length = " << Msg->Length);
         return(XDMF_FAIL);
     }
-    if(Msg->Data <= 0 ){
+    if(Msg->Data == 0 ){
         XdmfErrorMessage("Cannot Receive Message into Data Buffer = " << Msg->Length);
         return(XDMF_FAIL);
     }
@@ -66,7 +66,7 @@
         XdmfErrorMessage("Cannot Send Message of Length = " << Msg->Length);
         return(XDMF_FAIL);
     }
-    if(Msg->Data <= 0 ){
+    if(Msg->Data == 0 ){
         XdmfErrorMessage("Cannot Send Message from Data Buffer = " << Msg->Length);
         return(XDMF_FAIL);
     }