weird C problem [SOLVED]

[Dj YB]

On Wednesday August 11 2010 19:39:55 Ralf Corsepius wrote:
> On 08/11/2010 06:31 PM, Dj YB wrote:

> > $ cc a.c
> > /tmp/ccTaon4H.o: In function `main':
> > a.c:(.text+0x3e): undefined reference to `sqrt'
> > 
> > to be sure I checked man sqrt:
> > 
> > SYNOPSIS
> > 
> > #include<math.h>
> > 
> > double sqrt(double x);
> 
> A couple of lines later you will find this sentence:
> "       Link with -lm."
> 
> Math functions are not contained in libc, they are in a separate library
> called libm.
> 
> => cc a.c -lm
> 
> Ralf

Thanks Ralf!
I knew there must be something really basic I am missing.

Regards,
YB.