[Nikkon]

I'm doing something like this:

#include <unistd.h>
#include <sys/types.h>

int main ( ) {

setresuid ( a, b, c );

}

And get this error :

main.cpp: In function `functionA ( )':
main.cpp:539: `setresuid' undeclared (first use this function)
main.cpp:539: (Each undeclared identifier is reported only once for each
function it appears in.)

I can man it but for some reason it doesn't exist when I try to compile.

Any ideas ??