diff -Naur clang-12.0.0rc1.src.orig/CMakeLists.txt clang-12.0.0rc1.src/CMakeLists.txt
--- clang-12.0.0rc1.src.orig/CMakeLists.txt	2021-02-14 21:40:31.000000000 +0100
+++ clang-12.0.0rc1.src/CMakeLists.txt	2021-02-14 21:41:57.000000000 +0100
@@ -153,12 +153,6 @@
         set(LLVM_UTILS_PROVIDED ON)
         set(CLANG_TEST_DEPS FileCheck count not)
       endif()
-      set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
-      if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h
-          AND NOT EXISTS ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}gtest${CMAKE_STATIC_LIBRARY_SUFFIX}
-          AND EXISTS ${UNITTEST_DIR}/CMakeLists.txt)
-        add_subdirectory(${UNITTEST_DIR} utils/unittest)
-      endif()
     else()
       # Seek installed Lit.
       find_program(LLVM_LIT
@@ -537,7 +531,11 @@
 
 
 if( CLANG_INCLUDE_TESTS )
-  if(EXISTS ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest/include/gtest/gtest.h)
+  set(UNITTEST_DIR ${LLVM_MAIN_SRC_DIR}/utils/unittest)
+  if(EXISTS ${UNITTEST_DIR}/googletest/include/gtest/gtest.h
+      AND NOT EXISTS ${LLVM_LIBRARY_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}gtest${CMAKE_STATIC_LIBRARY_SUFFIX}
+      AND EXISTS ${UNITTEST_DIR}/CMakeLists.txt)
+    add_subdirectory(${UNITTEST_DIR} utils/unittest)
     add_subdirectory(unittests)
     list(APPEND CLANG_TEST_DEPS ClangUnitTests)
     list(APPEND CLANG_TEST_PARAMS