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diff --git a/include/cstdlib b/include/cstdlib
index 9bf0ea3..d9ee863 100644
--- a/include/cstdlib
+++ b/include/cstdlib
@@ -142,11 +142,11 @@ using ::wctomb _LIBCPP_USING_IF_EXISTS;
using ::mbstowcs _LIBCPP_USING_IF_EXISTS;
using ::wcstombs _LIBCPP_USING_IF_EXISTS;
#endif
-#if !defined(_LIBCPP_CXX03_LANG)
+#if !defined(_LIBCPP_CXX03_LANG) && __has_attribute(using_if_exists)
using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
using ::quick_exit _LIBCPP_USING_IF_EXISTS;
#endif
-#if _LIBCPP_STD_VER >= 17
+#if _LIBCPP_STD_VER >= 17 && __has_attribute(using_if_exists) && !defined(_LIBCPP_MSVCRT)
using ::aligned_alloc _LIBCPP_USING_IF_EXISTS;
#endif
diff --git a/include/ctime b/include/ctime
index b61e19d..e537bbe 100644
--- a/include/ctime
+++ b/include/ctime
@@ -66,7 +66,7 @@ using ::clock_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::time_t _LIBCPP_USING_IF_EXISTS;
using ::tm _LIBCPP_USING_IF_EXISTS;
-#if _LIBCPP_STD_VER >= 17
+#if _LIBCPP_STD_VER >= 17 && __has_attribute(using_if_exists)
using ::timespec _LIBCPP_USING_IF_EXISTS;
#endif
using ::clock _LIBCPP_USING_IF_EXISTS;
@@ -78,7 +78,7 @@ using ::ctime _LIBCPP_USING_IF_EXISTS;
using ::gmtime _LIBCPP_USING_IF_EXISTS;
using ::localtime _LIBCPP_USING_IF_EXISTS;
using ::strftime _LIBCPP_USING_IF_EXISTS;
-#if _LIBCPP_STD_VER >= 17
+#if _LIBCPP_STD_VER >= 17 && __has_attribute(using_if_exists)
using ::timespec_get _LIBCPP_USING_IF_EXISTS;
#endif
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