diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf0faa77d3b..6200de1e37f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -411,7 +411,9 @@ set( CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_TOOLS_BINARY_DIR} )
 set( CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib )
 set( CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LLVM_BINARY_DIR}/lib )
 
-set( CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
+if( NOT DEFINED CMAKE_INSTALL_RPATH )
+  set( CMAKE_INSTALL_RPATH "\$ORIGIN/../lib")
+endif( NOT DEFINED CMAKE_INSTALL_RPATH )
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)