The documentation says that -l must be used if -d is specified,
but roundup-server exits with no output if this is not followed.

My guess is roundup-server forks then fails to open a log file which
causes it to crash and since it has already disassociated from the controlling
terminal the error message is lost.

What should happen is that an error reporting the missing -l logfile option when - is used
should be reported to stdout/stderr along with the full help text.