Index: lit/CMakeLists.txt
===================================================================
--- lit/CMakeLists.txt
+++ lit/CMakeLists.txt
@@ -11,7 +11,7 @@
   set(ENABLE_SHARED 0)
 endif(BUILD_SHARED_LIBS)
 
-option(LLDB_TEST_CLANG "Use in-tree clang when testing lldb" Off)
+option(LLDB_TEST_CLANG "Use in-tree clang when testing lldb" On)
 set(LLDB_TEST_C_COMPILER "" CACHE STRING "C compiler to use when testing LLDB")
 set(LLDB_TEST_CXX_COMPILER "" CACHE STRING "C++ compiler to use when testing LLDB")