diff -up ParaView-3.12.0/Utilities/Xdmf2/vtk/Testing/Cxx/XdmfTestVTKIO.cxx.gcc47 ParaView-3.12.0/Utilities/Xdmf2/vtk/Testing/Cxx/XdmfTestVTKIO.cxx
--- ParaView-3.12.0/Utilities/Xdmf2/vtk/Testing/Cxx/XdmfTestVTKIO.cxx.gcc47	2011-11-08 13:56:29.000000000 -0700
+++ ParaView-3.12.0/Utilities/Xdmf2/vtk/Testing/Cxx/XdmfTestVTKIO.cxx	2012-01-27 09:30:00.088542888 -0700
@@ -37,6 +37,8 @@
 #include "vtkTimeSourceExample.h"
 #include "vtkXdmfReader.h"
 
+#include <unistd.h>
+
 #define NUMTESTS 20
 
 const char testobject[NUMTESTS][40] = {