diff --git a/lldb/test/CMakeLists.txt b/lldb/test/CMakeLists.txt
--- a/lldb/test/CMakeLists.txt
+++ b/lldb/test/CMakeLists.txt
@@ -117,23 +117,12 @@
       endif()
     else()
       # We require libcxx for the test suite, so if we aren't building it,
-      # try to provide a helpful error about how to resolve the situation.
+      # provide a helpful error about how to resolve the situation.
       if(NOT TARGET cxx AND NOT libcxx IN_LIST LLVM_ENABLE_RUNTIMES)
-        if(LLVM_ENABLE_PROJECTS STREQUAL "")
-          # If `LLVM_ENABLE_PROJECTS` is not being used (implying that we are
-          # using the old layout), suggest checking it out.
-          message(FATAL_ERROR
-            "LLDB test suite requires libc++, but it is currently disabled. "
-            "Please checkout `libcxx` in `llvm/projects` or disable tests "
-            "via `LLDB_INCLUDE_TESTS=OFF`.")
-        else()
-          # If `LLVM_ENABLE_PROJECTS` is being used, suggest adding it.
-          message(FATAL_ERROR
-            "LLDB test suite requires libc++, but it is currently disabled. "
-            "Please add `libcxx` to `LLVM_ENABLE_PROJECTS` or "
-            "`LLVM_ENABLE_RUNTIMES`, or disable tests via "
-            "`LLDB_INCLUDE_TESTS=OFF`.")
-        endif()
+        message(FATAL_ERROR
+          "LLDB test suite requires libc++, but it is currently disabled. "
+          "Please add `libcxx` to `LLVM_ENABLE_RUNTIMES` or disable tests via "
+          "`LLDB_INCLUDE_TESTS=OFF`.")
       endif()
     endif()
   endif()