--- gnuchess-5.07/src/common.h.orig 2005-05-26 13:15:05.000000000 -0400 +++ gnuchess-5.07/src/common.h 2005-05-26 13:14:33.000000000 -0400 @@ -716,7 +716,7 @@ /* Input thread and thread function */ #include <pthread.h> -extern pthread_t input_thread; +static pthread_t input_thread; void *input_func(void *); /*