diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -26,6 +26,7 @@
 
   set(LLVM_COMMON_CMAKE_UTILS "${FLANG_SOURCE_DIR}/../cmake")
   set(LLVM_CMAKE_UTILS "${FLANG_SOURCE_DIR}/../llvm/cmake")
+  set(CLANG_CMAKE_UTILS "${FLANG_SOURCE_DIR}/../clang/cmake")
 
   # Add path for custom modules
   list(INSERT CMAKE_MODULE_PATH 0
@@ -35,8 +36,10 @@
     "${LLVM_COMMON_CMAKE_UTILS}/Modules"
     "${LLVM_CMAKE_UTILS}"
     "${LLVM_CMAKE_UTILS}/modules"
+    "${CLANG_CMAKE_UTILS}/modules"
     )
 
+  include(AddClang)
   include(AddLLVM)
   include(AddFlang)
   include(HandleLLVMOptions)