--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,7 +68,7 @@ 
 
   # Use -Werror for clang only.
   if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    if(NOT CMAKE_CXX_FLAGS MATCHES "-Werror")
+    if(0)
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
     endif(NOT CMAKE_CXX_FLAGS MATCHES "-Werror")
   endif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")