diff --git a/docs/index.rst b/docs/index.rst
index e2aca72..04df9cf 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -101,9 +101,9 @@
 The following minimum compiler versions are strongly recommended.
 
 * Clang 3.5 and above
-* GCC 4.7 and above.
+* GCC 5.0 and above.
 
-Anything older *may* work.
+The C++03 dialect is only supported for Clang compilers.
 
 C++ Dialect Support
 ---------------------
diff --git a/include/__config b/include/__config
index ef2795b..f68baa3 100644
--- a/include/__config
+++ b/include/__config
@@ -187,6 +187,10 @@
 #define _LIBCPP_CLANG_VER 0
 #endif
 
+#if defined(_LIBCPP_COMPILER_GCC) && __cplusplus < 201103L
+#error "libc++ does not support using GCC with C++03. Please enable C++11"
+#endif
+
 // FIXME: ABI detection should be done via compiler builtin macros. This
 // is just a placeholder until Clang implements such macros. For now assume
 // that Windows compilers pretending to be MSVC++ target the Microsoft ABI,