Index: libcxxabi/CMakeLists.txt
===================================================================
--- libcxxabi/CMakeLists.txt
+++ libcxxabi/CMakeLists.txt
@@ -504,21 +504,6 @@
     NO_DEFAULT_PATH
   )
 
-  find_path(
-    LIBCXXABI_LIBUNWIND_SOURCES
-    libunwind_ext.h
-    PATHS ${LIBCXXABI_LIBUNWIND_PATH}/src/
-          ${LIBCXXABI_LIBUNWIND_INCLUDES}/../src/
-          ${LLVM_MAIN_SRC_DIR}/projects/libunwind/src/
-          ${LLVM_MAIN_SRC_DIR}/runtimes/libunwind/src/
-    NO_DEFAULT_PATH
-  )
-
-  if (LIBCXXABI_LIBUNWIND_SOURCES STREQUAL "LIBCXXABI_LIBUNWIND_SOURCES-NOTFOUND")
-    message(WARNING "LIBCXXABI_LIBUNWIND_SOURCES was not specified and couldn't be infered.")
-    set(LIBCXXABI_LIBUNWIND_SOURCES "")
-  endif()
-
   if (LIBCXXABI_LIBUNWIND_INCLUDES_INTERNAL STREQUAL "LIBCXXABI_LIBUNWIND_INCLUDES_INTERNAL-NOTFOUND")
     set(LIBCXXABI_LIBUNWIND_INCLUDES_INTERNAL "")
   endif()
@@ -526,10 +511,6 @@
   if (NOT LIBCXXABI_LIBUNWIND_INCLUDES_INTERNAL STREQUAL "")
     include_directories("${LIBCXXABI_LIBUNWIND_INCLUDES_INTERNAL}")
   endif()
-
-  if (NOT LIBCXXABI_LIBUNWIND_SOURCES STREQUAL "")
-    include_directories("${LIBCXXABI_LIBUNWIND_SOURCES}")
-  endif()
 endif()
 
 # Add source code. This also contains all of the logic for deciding linker flags