diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index de13ab0df24e..e3f81cb4d627 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -123,7 +123,9 @@ foreach(proj ${LLVM_ENABLE_PROJECTS})
 endforeach()
 foreach(proj "libcxx" "libcxxabi" "libunwind")
   if (${proj} IN_LIST LLVM_ENABLE_PROJECTS)
-    message(FATAL_ERROR
+    # TODO(Ericson2314): Making non-fatal for now because of out-of-tree docs
+    # CI jobs use this.
+    message(SEND_ERROR
       "Using LLVM_ENABLE_PROJECTS=${proj} is incorrect. Please use -DLLVM_ENABLE_RUNTIMES=${proj} or "
       "see the instructions at https://libcxx.llvm.org/BuildingLibcxx.html for building the runtimes.")
   endif()