diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0034179..06003b35 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,9 @@ ADD_BII_TARGETS()
 
 ADD_BOOST(filesystem system thread)
 # This is needed by boost thread
-TARGET_LINK_LIBRARIES(${BII_BLOCK_TARGET} INTERFACE rt)
+IF(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  TARGET_LINK_LIBRARIES(${BII_BLOCK_TARGET} INTERFACE rt)
+ENDIF(CMAKE_SYSTEM_NAME)
 
 ACTIVATE_CPP14()
 ENABLE_STYLE_WARNINGS()