@@ -6,10 +6,15 @@
  *
  * This file is part of libobjfw. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE included in
  * the packaging of this file.
  */
+
+#ifndef OF_CONFIGURED
+#error You are missing the libobjfw definitions!
+#error Please use objfw-config!
+#endif
 
 #ifdef __GNUC__
 #define OF_INLINE inline __attribute__((always_inline))
 #define OF_LIKELY(cond) __builtin_expect(!!(cond), 1)
 #define OF_UNLIKELY(cond) __builtin_expect(!!(cond), 0)