+#ifndef wxUSE_INTL
+# ifdef wxABORT_ON_CONFIG_ERROR
+# error "wxUSE_INTL must be defined."
+# else
+# define wxUSE_INTL 0
+# endif
+#endif /* !defined(wxUSE_INTL) */
+
+#ifndef wxUSE_IPV6
+# ifdef wxABORT_ON_CONFIG_ERROR
+# error "wxUSE_IPV6 must be defined."
+# else
+# define wxUSE_IPV6 0
+# endif
+#endif /* !defined(wxUSE_IPV6) */
+