New user: Linux: undefined reference to fetestexcept

On Intel x86_64, running Linux Fedora 15 x86_64,
after using Add Software of 'clang' and 'clang-doc',
(which got version 2.8.11)
when I try to compile and run the program
  http://www.tybor.com/tflt2int.c
via the command line: clang -std=c99 tflt2int.c
I am getting undefined references to both
fetestexcept and feclearexcept

Are there headers or libraries that I need to tell
the compiler about?

Fred J. Tydeman wrote:

I am getting undefined references to both
fetestexcept and feclearexcept

Are there headers or libraries that I need to tell
the compiler about?
  
You probably need "-lm". Not a clang-specific thing, though; you'd need that for gcc, too.

--Patrick

You are correct. Thanks. When I see -lm, I think math library,
which to me is just <math.h>. But, it is probably also <fenv.h>
and <complex.h>, and maybe others.