I am having trouble with arc4random on Ubuntu 9.04. I installed the libbsd-dev package, and "man arc4random" does bring up the man page. But if I try to compile this program:

#include <stdio.h>
#include <stdlib.h>

main()
{
int x;
x=arc4random();
printf("%i\n", x);
return 0;
}

I get the following result:

56$gcc -o test test.c
/tmp/ccQeErYt.o: In function `main':
test.c.text+0xe): undefined reference to `arc4random'
collect2: ld returned 1 exit status

How do I get this to work?

P.S. I have also posted this question at ubuntuforums.org (I hope it's not considered unethical for some reason to post it in two places). I've received no response there.

You need to link to libbsd. Try this:

That solves my problem. Thank you very much for your help.