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From: seebs@plethora.net (Peter Seebach)
To: Vince Sabio <vince@vjs.org>
In-reply-to: Your message of "Mon, 08 Nov 2004 14:00:33 EST."
             <p05200f14bdb56efeb236@[192.168.0.5]> 
Date: Mon, 08 Nov 2004 13:03:54 -0600
cc: freebsd-questions@freebsd.org
Subject: Re: math.h doesn't include pow? 
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In message <p05200f14bdb56efeb236@[192.168.0.5]>, Vince Sabio writes:
>My C library documentation states that the "pow" (power) function is 
>included in math.h. However, when I go to link (compiling and linking 
>with gcc), I get the following:
>
>In function `[function name]':
>[path/]datetime.c:668: undefined reference to `pow'
>
>Yes, I'm including <math.h>. If I compile the exact same code under 
>Darwin (BSD on PowerPC), it compiles fine. It also compiles in 
>CodeWarrior. Is anyone else familiar with this problem? Could I have 
>a path set up incorrectly, and be using the wrong libraries?
>
>Running FreeBSD v5.1, installed from CD, including the developer 
>tools. Single-boot system; there is no Microsoft software anywhere on 
>the machine, so it's not their fault (for a change). ;-)

FAQ.

Very FAQ.

Headers and libraries are distinct.  Headers provide prototypes; libraries
provide definitions.  You want "-lm".

-s