@@ -14,8 +14,9 @@
 #undef OF_HAVE_PTHREADS
 #undef OF_HAVE_PTHREAD_SPINLOCKS
 #undef OF_HAVE_SCHED_YIELD
 #undef OF_HAVE_SYS_SELECT_H
 #undef OF_OBJFW_RUNTIME
+#undef OF_OLD_GNU_RUNTIME
 #undef OF_PLUGINS
 #undef OF_THREADS
 #undef SIZE_MAX