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Old 05-30-2009, 10:38 PM   #1
Greg Marks
LQ Newbie
Registered: May 2009
Posts: 15

Rep: Reputation: 2
trouble using arc4random() in C program on Ubuntu

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>

int x;
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 (I hope it's not considered unethical for some reason to post it in two places). I've received no response there.
Old 05-30-2009, 10:55 PM   #2
HCL Maintainer
Registered: Jan 2006
Distribution: (H)LFS, Gentoo
Posts: 2,450

Rep: Reputation: 76
Originally Posted by Greg Marks View Post
$gcc -o test test.c
You need to link to libbsd. Try this:
$ gcc -lbsd -o test test.c
Old 05-31-2009, 01:08 AM   #3
Greg Marks
LQ Newbie
Registered: May 2009
Posts: 15

Original Poster
Rep: Reputation: 2
That solves my problem. Thank you very much for your help.


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