diff --git a/lldb/test/CMakeLists.txt b/lldb/test/CMakeLists.txt
--- a/lldb/test/CMakeLists.txt
+++ b/lldb/test/CMakeLists.txt
@@ -135,9 +135,16 @@
             "`LLDB_INCLUDE_TESTS=OFF`.")
         endif()
       endif()
-      add_lldb_test_dependency(cxx)
     endif()
   endif()
+
+  # Add libc++ dependency for libc++-specific tests. This is an optional
+  # dependency as it's also possible to run the libc++ tests against the libc++
+  # installed on the system.
+  if (TARGET cxx)
+    add_lldb_test_dependency(cxx)
+  endif()
+
 endif()
 
 if (LLDB_BUILT_STANDALONE)