This solves a compilation problem in Clang 3.5 where the class Time is

not completely instantiated in objectRegistry (see error message
below)

By including objectRegistry.H before Time.H the class Tiem gets
completely defined before objectRegistry.

The original Time.H could be omitted (as it is already included in
objectRegistry.H )

In file included from blockMeshApp.C:49:
In file included from /Users/bgschaid/OpenFOAM/foam-extend-3.1/src/foam/lnInclude/Time.H:42:
In file included from /Users/bgschaid/OpenFOAM/foam-extend-3.1/src/foam/lnInclude/objectRegistry.H:235:
/Users/bgschaid/OpenFOAM/foam-extend-3.1/src/foam/lnInclude/objectRegistryTemplates.C:94:25: error: 'const Foam::Time' is an incomplete type
        if (&parent_ != dynamic_cast<const objectRegistry*>(&time_))
                        ^                                   ~~~~~~
/Users/bgschaid/OpenFOAM/foam-extend-3.1/src/foam/lnInclude/IOobject.H:78:7: note: forward declaration of 'Foam::Time'
class Time;
      ^
In file included from blockMeshApp.C:49:

applications/utilities/mesh/conversion/ansysToFoam/ansysToFoam.L

@@ -47,6 +47,7 @@ Description
 using namespace Foam;
 
 #include "argList.H"
+#include "objectRegistry.H"
 #include "Time.H"
 #include "polyMesh.H"
 #include "emptyPolyPatch.H"

applications/utilities/mesh/conversion/cfx4ToFoam/cfx4ToFoam.C

@@ -30,6 +30,7 @@ Description
 \*---------------------------------------------------------------------------*/
 
 #include "argList.H"
+#include "objectRegistry.H"
 #include "Time.H"
 #include "IFstream.H"
 #include "hexBlock.H"

applications/utilities/mesh/conversion/fluentMeshToFoam/fluentMeshToFoam.L

@@ -39,6 +39,7 @@ Description
  \* ------------------------------------------------------------------------- */
 
 #include "argList.H"
+#include "objectRegistry.H"
 #include "Time.H"
 #include "IStringStream.H"
 #include "polyMesh.H"

applications/utilities/mesh/conversion/gambitToFoam/gambitToFoam.L

@@ -46,6 +46,7 @@ Description
 using namespace Foam;
 
 #include "argList.H"
+#include "objectRegistry.H"
 #include "Time.H"
 #include "polyMesh.H"
 #include "emptyPolyPatch.H"

applications/utilities/mesh/conversion/kivaToFoam/kivaToFoam.C

@@ -30,6 +30,7 @@ Description
 \*---------------------------------------------------------------------------*/
 
 #include "argList.H"
+#include "objectRegistry.H"
 #include "Time.H"
 #include "polyMesh.H"
 #include "IFstream.H"

applications/utilities/mesh/generation/blockMesh/blockMeshApp.C

@@ -46,6 +46,7 @@ Usage
 
 \*---------------------------------------------------------------------------*/
 
+#include "objectRegistry.H"
 #include "Time.H"
 #include "IOdictionary.H"
 #include "IOPtrList.H"