Currently on GNU/Hurd the timer_* functions are not implemented; check's configure detects that and switches to the replacements functions in lib/, which use alarm for the timer. However, using alarm does not allow a timeout precision more than 1 second (as also written in the comments in lib/timer_settime.c), causing the failure of the two tests check_check_export and check_check.
As a workaround, it is possible to get a better precision using the POSIX function setitimer [1] (declared obsolescent, but still usable) instead of alarm.
The attached patch checks for the existance of setitimer, and in case it exists uses it (with its ITIMER_REAL timer) in the replacement timer_settime and timer_delete. Given they are implemented in the Hurd, all the tests of check passes.
[1] http://pubs.opengroup.org/onlinepubs/9699919799/functions/getitimer.html
