Index: unittests/CMakeLists.txt
===================================================================
--- unittests/CMakeLists.txt
+++ unittests/CMakeLists.txt
@@ -23,7 +23,7 @@
   endif()
 
   lldb_link_common_libs(${test_name} EXE)
-  target_link_libraries(${test_name} ${CLANG_USED_LIBS})
+  target_link_libraries(${test_name} ${CLANG_USED_LIBS} ${LLDB_SYSTEM_LIBS})
   llvm_config(${test_name} ${LLVM_LINK_COMPONENTS})
 endfunction()