diff --git a/runtimes/CMakeLists.txt b/runtimes/CMakeLists.txt
--- a/runtimes/CMakeLists.txt
+++ b/runtimes/CMakeLists.txt
@@ -75,11 +75,11 @@
 set(LLVM_RUNTIME_OUTPUT_INTDIR ${LLVM_TOOLS_BINARY_DIR})
 
 # This variable makes sure that e.g. llvm-lit is found.
-set(LLVM_MAIN_SRC_DIR ${LLVM_BUILD_MAIN_SRC_DIR})
+set(LLVM_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../llvm)
 set(LLVM_CMAKE_PATH ${LLVM_MAIN_SRC_DIR}/cmake/modules)
 
 # This variable is used by individual runtimes to locate LLVM files.
-set(LLVM_PATH ${LLVM_BUILD_MAIN_SRC_DIR})
+set(LLVM_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../llvm)
 
 if(APPLE)
   set(LLVM_ENABLE_LIBCXX ON CACHE BOOL "")