diff -crB gnuchess-5.07/src/common.h gnuchess-5.07.mod/src/common.h
*** gnuchess-5.07/src/common.h	2003-06-30 13:28:38.000000000 +0200
--- gnuchess-5.07.mod/src/common.h	2010-03-19 20:32:10.474722004 +0100
***************
*** 716,722 ****
  
  /* Input thread and thread function */
  #include <pthread.h>
! extern pthread_t input_thread;
  void *input_func(void *);
  
  /*
--- 716,722 ----
  
  /* Input thread and thread function */
  #include <pthread.h>
! static pthread_t input_thread;
  void *input_func(void *);
  
  /*
