g++3.0.3 can't do with sleep()

[James Shen]

Hi,

I think this is a bug for g++3.0.3 (Solaris). I downloaded a package
of G++3.0.3
and compiled it on my solaris2.6 (SPARC). After  installation, I test
it
by a little program as below

//test.cc
#incldue <stdio.h>
#include <unistd.h>

main() {

printf("this is a test for g++3\n");
sleep(5);
printf("succeed!\n");

}

I compile it using g++ , but it always shows : 

test.cc: In function `int main()':
test.cc:9: `sleep' undeclared (first use this function)
test.cc:9: (Each undeclared identifier is reported only once for each
function it appears in.)

But the same program can be compiled smoothly by Sun's CC and 
g++2.95.3 ( the g++3.0.3 and g++2.95.3 on the same solaris box ).

I don't know whether I missed some option when compiling g++3.0.3 but
I compile
g++2.95.3 with the default configuration. 

If there is mistake correct me please.

James