Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -171,6 +171,16 @@
     endif()
   endif()
 
+  if (LLVM_ENABLE_SPHINX)
+    message(STATUS "Sphinx enabled.")
+    find_package(Sphinx REQUIRED)
+    if (LLVM_BUILD_DOCS)
+      add_custom_target(sphinx ALL)
+    endif()
+  else()
+    message(STATUS "Sphinx disabled.")
+  endif()
+
   set( CLANG_BUILT_STANDALONE 1 )
   set(BACKEND_PACKAGE_STRING "LLVM ${LLVM_PACKAGE_VERSION}")
 else()