--- cfe-3.8.1.src/lib/Driver/CMakeLists.txt.orig	2015-07-02 04:45:27.000000000 +0000
+++ cfe-3.8.1.src/lib/Driver/CMakeLists.txt	2017-01-19 19:22:36.869663323 +0000
@@ -3,6 +3,8 @@
   Support
   )
 
+add_definitions(-DLLVM_PREFIX="${LLVM_PREFIX}")
+
 add_clang_library(clangDriver
   Action.cpp
   Compilation.cpp