diff --git a/Utilities/ITK/CMakeLists.txt b/Utilities/ITK/CMakeLists.txt
index 495a98445d8dc7316948c10611e06f951bd058ef..aec013c0ab08647c862a8d42dc81b197a3bf3e06 100644
--- a/Utilities/ITK/CMakeLists.txt
+++ b/Utilities/ITK/CMakeLists.txt
@@ -261,21 +261,37 @@ ENDIF(MINGW)
 
 #-----------------------------------------------------------------------------
 # Adjust the compiler flags to avoid all warning.
-IF(CMAKE_COMPILER_IS_GNUCXX)
-  # Hide warnings in ossim code.
-  SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w")
-
-  # CMake versions before 2.4 did not put the source-file-specific flags
-  # after the directory-level flags.  Remove optimization flags from the
-  # CMAKE_CXX_FLAGS* variables so they can be overridden.
-  IF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
-    FOREACH(c "" "_DEBUG" "_RELEASE" "_MINSIZEREL" "_RELWITHDEBINFO")
-      STRING(REGEX REPLACE
-        "-O[^ ]*( |$)" "" CMAKE_CXX_FLAGS${c} "${CMAKE_CXX_FLAGS${c}}")
-    ENDFOREACH(c)
-  ENDIF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
+IF(UNIX)
 
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+  IF(CMAKE_COMPILER_IS_GNUCXX)
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w")
+
+    # CMake versions before 2.4 did not put the source-file-specific flags
+    # after the directory-level flags.  Remove optimization flags from the
+    # CMAKE_CXX_FLAGS* variables so they can be overridden.
+    IF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
+      FOREACH(c "" "_DEBUG" "_RELEASE" "_MINSIZEREL" "_RELWITHDEBINFO")
+        STRING(REGEX REPLACE
+          "-O[^ ]*( |$)" "" CMAKE_CXX_FLAGS${c} "${CMAKE_CXX_FLAGS${c}}")
+      ENDFOREACH(c)
+    ENDIF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
+  ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+
+  IF(CMAKE_COMPILER_IS_GNUCC)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
+
+    # CMake versions before 2.4 did not put the source-file-specific flags
+    # after the directory-level flags.  Remove optimization flags from the
+    # CMAKE_C_FLAGS* variables so they can be overridden.
+    IF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
+      FOREACH(c "" "_DEBUG" "_RELEASE" "_MINSIZEREL" "_RELWITHDEBINFO")
+        STRING(REGEX REPLACE
+          "-O[^ ]*( |$)" "" CMAKE_C_FLAGS${c} "${CMAKE_C_FLAGS${c}}")
+      ENDFOREACH(c)
+    ENDIF("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.4)
+  ENDIF(CMAKE_COMPILER_IS_GNUCC)
+
+ENDIF(UNIX)
 
 #-----------------------------------------------------------------------------
 # Find platform-specific differences in the handling of IEEE floating point