Problem making the sandbox

[charliedaly]

In the instructions:
https://github.com/hit-moodle/onlinejudge/wiki/Installation

I have to make the sandbox. When I run make I get

make -C libsandbox libsandbox.a
make[1]: Entering directory /var/www/html/moodle/mod/assignment/type/onlinejudge/judge/sandbox/sand/libsandbox' make[1]:libsandbox.a' is up to date.
make[1]: Leaving directory `/var/www/html/moodle/mod/assignment/type/onlinejudge/judge/sandbox/sand/libsandbox'
./runtest.sh 1 stdin_test < /dev/null
./runtest.sh 1 stdout_test > /dev/null
./runtest.sh 2 fork_test
./runtest.sh 2 open_test
./runtest.sh 3 -l memory=1048576 memlimit_test
make: *** [memlimit] Error 1

I am using 64 bit Ubuntu 14.04

[13098873679]

你是怎么解决的