dbconfig.c: In function ‘DCsync_configuration’:
dbconfig.c:4628:2: warning: call to function ‘zbx_dbsync_free_env’ without a real prototype [-Wunprototyped-calls]
  zbx_dbsync_free_env(config);
  ^
In file included from dbconfig.c:41:0:
dbsync.h:109:6: note: ‘zbx_dbsync_free_env’ was declared here
 void zbx_dbsync_free_env();
      ^