A Linux kernel version greater than or equal to version 1.3.73 is required, and I recommended 2.x. The kernel source is available from http://sunsite.unc.edu/pub/Linux/kernel/v2.0
Depending on the Linux distribution you have, you may not have the process accounting software package installed on your system. If you don't have it, try downloading the package from http://sunsite.unc.edu/pub/Linux/system/admin/quota-acct-modified.tgz