From Paul Fotheringham, fixed linux build error when compiling dicom plugin against ITK by adding define VCL_CAN_STATIC_CONST_INIT_FLOAT to be zero.

From Robert Osfield, general clean up of CMakeLists.txt under ITK side

src/osgPlugins/dicom/CMakeLists.txt

@@ -1,7 +1,7 @@
 IF  (DCMTK_FOUND)
 
     # note, we have to include a '/' in front of the directory string to prevent a CMake bug from ignoring the directory
-    INCLUDE_DIRECTORIES(/${DCMTK_ROOT_INCLUDE_DIR})
+    INCLUDE_DIRECTORIES(${DCMTK_ROOT_INCLUDE_DIR})
 
     SET(TARGET_SRC ReaderWriterDICOM.cpp )
 
@@ -15,23 +15,22 @@ ELSE(DCMTK_FOUND)
 
     INCLUDE(${ITK_USE_FILE})
 
-    INCLUDE_DIRECTORIES( ITK_INCLUDE_DIRS )
-
     SET(TARGET_SRC ReaderWriterDICOM.cpp )
 
-    LINK_DIRECTORIES(${ITK_LIBRARY_DIRS})
-
-    # LINK_LIBRARIES(${ITK_LIBRARIES})
-
     LINK_LIBRARIES(ITKCommon ITKIO)
 
     ADD_DEFINITIONS(-DUSE_ITK)
+    ADD_DEFINITIONS(-DVCL_CAN_STATIC_CONST_INIT_FLOAT=0)
 
     ENDIF(ITK_FOUND)
 
 ENDIF(DCMTK_FOUND)
-
 SET(TARGET_ADDED_LIBRARIES osgVolume )
 
+IF(CMAKE_COMPILER_IS_GNUCXX)
+    # Remove -pedantic flag as it barfs on ffmoeg headers
+   STRING(REGEX REPLACE "-pedantic" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+ENDIF()
+
 #### end var setup  ###
 SETUP_PLUGIN(dicom dicom)