use installed library during the execution of the runguard

Hello, I installed a software library on my debian system with apt-get. But the library doesn't appear in the /usr/lib folder during the runguard execution. As i understood you create temporary symbolic link in the root folder of the chroot execution which is located in the folder c<contest>-s<problem>-j<id>.

From where do you create your symbolic link.

Regards Guillaume