diff --git a/Source/CTest/CMakeLists.txt b/Source/CTest/CMakeLists.txt
index f59146289..72daf1e88 100644
--- a/Source/CTest/CMakeLists.txt
+++ b/Source/CTest/CMakeLists.txt
@@ -1,6 +1,13 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 1.5)
 PROJECT(CTEST CXX)
 
+#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.*")
+
 SUBDIRS(Curl)
 
 FIND_LIBRARY(CMAKE_LIBRARY NAMES CMakeLib PATHS 
@@ -18,4 +25,4 @@ INCLUDE_DIRECTORIES(${CTEST_SOURCE_DIR}/..
 
 ADD_DEFINITIONS(-DHAVE_CURL)
 ADD_EXECUTABLE(ctest ${CTEST_SRCS})
-TARGET_LINK_LIBRARIES(ctest ${CMAKE_LIBRARY} Curl)
\ No newline at end of file
+TARGET_LINK_LIBRARIES(ctest ${CMAKE_LIBRARY} Curl)