--- a/utils/TableGen/CMakeLists.txt       (revision 190146)
+++ b/utils/TableGen/CMakeLists.txt       (working copy)
@@ -1,4 +1,5 @@
 set(LLVM_LINK_COMPONENTS Support)
+set(LLVM_TOOLS_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 add_tablegen(clang-tblgen CLANG
   ClangASTNodesEmitter.cpp