diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index e72cfbe1c..28dfe5c70 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -23,6 +23,8 @@ if(PYTHONINTERP_FOUND)
   set(LIT_ARGS "${LLVM_LIT_ARGS}")
   separate_arguments(LIT_ARGS)
 
+  option(LIBCXX_LIT_VARIANT "Configuration variant to use for LIT." "libcxx")
+
   pythonize_bool(LIBCXX_ENABLE_EXCEPTIONS)
   pythonize_bool(LIBCXX_ENABLE_RTTI)
   pythonize_bool(LIBCXX_ENABLE_SHARED)
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
index 17c1f0d8b..59c44b825 100644
--- a/test/lit.site.cfg.in
+++ b/test/lit.site.cfg.in
@@ -13,6 +13,7 @@ config.enable_monotonic_clock   = "@LIBCXX_ENABLE_MONOTONIC_CLOCK@"
 config.cxx_abi                  = "@LIBCXX_CXX_ABI_LIBNAME@"
 config.use_sanitizer            = "@LLVM_USE_SANITIZER@"
 config.abi_library_path         = "@LIBCXX_CXX_ABI_LIBRARY_PATH@"
+config.configuration_variant    = "@LIBCXX_LIT_VARIANT@"
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@LIBCXX_SOURCE_DIR@/test/lit.cfg")