diff --git a/config-post.h b/config-post.h
index 7c07e05340..415cc8cc72 100644
--- a/config-post.h
+++ b/config-post.h
@@ -32,6 +32,20 @@
     ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
 #endif
 
-#if !(__GNUC_PREREQ(4, 8) || defined(__clang__))
-# error "Libvirt requires GCC >= 4.8, or CLang"
+#if defined(__clang_major__) && defined(__clang_minor__)
+# ifdef __apple_build_version__
+#  if __clang_major__ < 5 || (__clang_major__ == 5 && __clang_minor__ < 1)
+#   error You need at least XCode Clang v5.1 to compile QEMU
+#  endif
+# else
+#  if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ < 4)
+#   error You need at least Clang v3.4 to compile QEMU
+#  endif
+# endif
+#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
+# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
+#  error You need at least GCC v4.8 to compile QEMU
+# endif
+#else
+# error You either need at least GCC 4.8 or Clang 3.4 or XCode Clang 5.1 to compile libvirt
 #endif