gcc compiler, version egcs 1.1.1

[Henry Abrecht]

Hello,

I have what I believe is version 2.8.1 of your c compiler--or is it
> egcs-1.1.1? I got that number from the man notes on gcc. My platform is Caldera OpenLinux 2.2. 

  My problem: I'm trying to declare and call math
> functions--specifically sin(x), cos(x), sqrt(x), pow(x, y).
> When I call them and include math.h (or is it tgmath.h?) I get
the
> message: "function undefined." When I declare them (ex: double
> sqrt(double)) I get the same message.
> 
> My question: What's the correct prototype format for these
functions?
> (or more generally, how are they declared and called?) If it
helps, I'm
> using a book called "A Book on C," by Al Kelley and Ira Pohl. On
his Web
> site Pohl indicates that libraries used by c compilers might have
changed
> since he wrote his book. He recommends that users contact the compiler maker for the correct function prototypes. (Pohl's book is based on GCC 2.7.)

Thanks,
Henry Abrecht