diff --git a/flang/lib/Frontend/CMakeLists.txt b/flang/lib/Frontend/CMakeLists.txt
--- a/flang/lib/Frontend/CMakeLists.txt
+++ b/flang/lib/Frontend/CMakeLists.txt
@@ -3,6 +3,9 @@
   CompilerInvocation.cpp
   FrontendOptions.cpp
 
+  DEPENDS
+  clangBasic
+
   LINK_LIBS
   clangBasic
   clangDriver
diff --git a/flang/lib/FrontendTool/CMakeLists.txt b/flang/lib/FrontendTool/CMakeLists.txt
--- a/flang/lib/FrontendTool/CMakeLists.txt
+++ b/flang/lib/FrontendTool/CMakeLists.txt
@@ -1,6 +1,9 @@
 add_flang_library(flangFrontendTool
   ExecuteCompilerInvocation.cpp
 
+  DEPENDS
+  clangBasic
+
   LINK_LIBS
   clangBasic
   clangDriver