Compiling VirtualJaguar: 'usleep' was not declared in this scope

I had a little trouble compiling VirtualJaguar on my Linux machine. Everytime I run make I got the following error (on different machines with different Slackware versions): 

Linux ACL's

That root can do everything with the files and directories user created will be slightly ignored in this article. Another thing I am doing different here is the prompt of each user. In normal cases I use the # for the root prompt and $ for the user prompt. In this article I will use ajolie$ for the prompt for the user ajolie and so on. The command will be done with the user that stand in front of the $.