diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5b58e467..4f492adce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,13 @@ IF(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 1.4)
   INCLUDE (${CMAKE_ROOT}/Modules/CMakeBackwardCompatibilityCXX.cmake)
 ENDIF(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 1.4)
 
+#silence duplicate symbol warnings on AIX
+IF(CMAKE_SYSTEM MATCHES "AIX.*")
+  IF(NOT CMAKE_COMPILER_IS_GNUCXX)
+     SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -bhalt:5 ")
+  ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)
+ENDIF(CMAKE_SYSTEM MATCHES "AIX.*")
+
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")